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WestRock Co. – ‘10-K’ for 9/30/22 – ‘EX-101.LAB’

On:  Friday, 11/18/22, at 4:08pm ET   ·   For:  9/30/22   ·   Accession #:  950170-22-25444   ·   File #:  1-38736

Previous ‘10-K’:  ‘10-K’ on 11/19/21 for 9/30/21   ·   Next & Latest:  ‘10-K’ on 11/17/23 for 9/30/23   ·   32 References:   

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  As Of               Filer                 Filing    For·On·As Docs:Size             Issuer                      Filing Agent

11/18/22  WestRock Co.                      10-K        9/30/22  145:44M                                    Donnelley … Solutions/FA

Annual Report   —   Form 10-K

Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: 10-K        Annual Report                                       HTML  10.68M 
 4: EX-10.15(A)  Material Contract                                  HTML    850K 
 5: EX-10.15(B)  Material Contract                                  HTML    146K 
 6: EX-10.15(C)  Material Contract                                  HTML    201K 
 7: EX-10.15(D)  Material Contract                                  HTML    159K 
 3: EX-10.19    Material Contract                                   HTML     84K 
 2: EX-10.7     Material Contract                                   HTML    234K 
 8: EX-21       Subsidiaries List                                   HTML     42K 
 9: EX-23       Consent of Expert or Counsel                        HTML     41K 
10: EX-31.1     Certification -- §302 - SOA'02                      HTML     47K 
11: EX-31.2     Certification -- §302 - SOA'02                      HTML     47K 
12: EX-32.1     Certification -- §906 - SOA'02                      HTML     43K 
18: R1          Document and Entity Information                     HTML    109K 
19: R2          Consolidated Statements of Operations               HTML    136K 
20: R3          Consolidated Statements of Comprehensive Income     HTML     96K 
                (Loss)                                                           
21: R4          Consolidated Balance Sheets                         HTML    170K 
22: R5          Consolidated Balance Sheets (Parenthetical)         HTML     55K 
23: R6          Consolidated Statements of Equity                   HTML    123K 
24: R7          Consolidated Statements of Equity (Parenthetical)   HTML     47K 
25: R8          Consolidated Statements of Cash Flows               HTML    167K 
26: R9          Description of Business and Summary of Significant  HTML    246K 
                Accounting Policies                                              
27: R10         Revenue Recognition                                 HTML    311K 
28: R11         Acquisitions and Investments                        HTML     48K 
29: R12         Restructuring and Other Costs                       HTML    539K 
30: R13         Retirement Plans                                    HTML   1.28M 
31: R14         Income Taxes                                        HTML    468K 
32: R15         Segment Information                                 HTML    957K 
33: R16         Interest                                            HTML     73K 
34: R17         Inventories                                         HTML     75K 
35: R18         Property, Plant and Equipment                       HTML     91K 
36: R19         Other Intangible Assets                             HTML    141K 
37: R20         Fair Value                                          HTML     89K 
38: R21         Debt                                                HTML    255K 
39: R22         Leases                                              HTML    287K 
40: R23         Special Purpose Entities                            HTML     55K 
41: R24         Related Party Transactions                          HTML     47K 
42: R25         Commitments and Contingencies                       HTML     87K 
43: R26         Accumulated Other Comprehensive Loss and Other      HTML    470K 
                Comprehensive Income (Loss)                                      
44: R27         Stockholders' Equity                                HTML     55K 
45: R28         Share-Based Compensation                            HTML    243K 
46: R29         Earnings per Share                                  HTML    124K 
47: R30         Subsequent Events                                   HTML     48K 
48: R31         Description of Business and Summary of Significant  HTML    306K 
                Accounting Policies (Policies)                                   
49: R32         Description of Business and Summary of Significant  HTML     80K 
                Accounting Policies (Tables)                                     
50: R33         Revenue Recognition (Tables)                        HTML    301K 
51: R34         Restructuring and Other Costs (Tables)              HTML    526K 
52: R35         Retirement Plans (Tables)                           HTML   1.24M 
53: R36         Income Taxes (Tables)                               HTML    444K 
54: R37         Segment Information (Tables)                        HTML    932K 
55: R38         Interest (Tables)                                   HTML     68K 
56: R39         Inventories (Tables)                                HTML     72K 
57: R40         Property, Plant and Equipment (Tables)              HTML     84K 
58: R41         Other Intangible Assets (Tables)                    HTML    138K 
59: R42         Fair Value (Tables)                                 HTML     66K 
60: R43         Debt (Tables)                                       HTML    153K 
61: R44         Leases (Tables)                                     HTML    292K 
62: R45         Accumulated Other Comprehensive Loss and Other      HTML    461K 
                Comprehensive Income (Loss) (Tables)                             
63: R46         Share-Based Compensation (Tables)                   HTML    199K 
64: R47         Earnings per Share (Tables)                         HTML    118K 
65: R48         Description of Business and Summary of Significant  HTML    210K 
                Accounting Policies - Additional Information                     
                (Details)                                                        
66: R49         Description of Business and Summary of Significant  HTML     48K 
                Accounting Policies - Schedule of Valuation and                  
                Qualifying Accounts Disclosure (Details)                         
67: R50         Description of Business and Summary of Significant  HTML     53K 
                Accounting Policies - Property, Plant and                        
                Equipment, Estimated Useful Lives (Details)                      
68: R51         Revenue Recognition - Additional Information        HTML     43K 
                (Details)                                                        
69: R52         Revenue Recognition - Schedule of Disaggregates     HTML     99K 
                Revenue by Geographical Market and Product Type                  
                (Segment) (Details)                                              
70: R53         Revenue Recognition - Summary of Opening and        HTML     50K 
                Closing Balances of Contract Assets and Contract                 
                Liabilities (Details)                                            
71: R54         Acquisitions and Investments - Additional           HTML     53K 
                Information (Details)                                            
72: R55         Restructuring and Other Costs - Additional          HTML     52K 
                Information (Details)                                            
73: R56         Restructuring and Other Costs - Schedule of         HTML     47K 
                Restructuring and Other Costs (Details)                          
74: R57         Restructuring and Other Costs - Schedule of         HTML    109K 
                Restructuring Charges Related to Active                          
                Restructuring Initiatives (Details)                              
75: R58         Restructuring and Other Costs - Schedule of         HTML     51K 
                Acquisition, Divestiture and Integration Costs                   
                (Details)                                                        
76: R59         Restructuring and Other Costs - Schedule of         HTML     49K 
                Changes in Restructuring Accrual Charges (Details)               
77: R60         Restructuring and Other Costs - Schedule of         HTML     56K 
                Reconciliation of Accruals and Charges (Details)                 
78: R61         Retirement Plans - Schedule of Allocation of Plan   HTML     66K 
                Assets - (Details)                                               
79: R62         Retirement Plans - Additional Information           HTML    128K 
                (Details)                                                        
80: R63         Retirement Plans - Schedule of Weighted-Average     HTML     56K 
                Assumptions Used to Measure Benefit Plan                         
                Obligations (Details)                                            
81: R64         Retirement Plans - Schedule of Changes in Benefit   HTML    136K 
                Obligations (Details)                                            
82: R65         Retirement Plans - Schedule of Amounts in           HTML     58K 
                Accumulated Other Comprehensive Loss (Details)                   
83: R66         Retirement Plans - Schedule of Amounts Recognized   HTML     64K 
                in Other Comprehensive Loss (Income) (Details)                   
84: R67         Retirement Plans - Summary of Components of Net     HTML     87K 
                Pension Income and Summary of Components of                      
                Postretirement Benefit Cost (Details)                            
85: R68         Retirement Plans - Schedule of Weighted-Average     HTML     59K 
                Assumptions Used in Calculation of Benefit Plan                  
                Expense (Details)                                                
86: R69         Retirement Plans - Schedule of Estimated Benefit    HTML     65K 
                Payments (Details)                                               
87: R70         Retirement Plans - Summary of Pension Plan Assets   HTML     93K 
                Measured at Fair Value on Recurring Basis                        
                (Details)                                                        
88: R71         Retirement Plans - Summary of Pension Plan Assets   HTML     41K 
                Measured at Fair Value on Recurring Basis                        
                (Parenthetical) (Details)                                        
89: R72         Retirement Plans - Summary of Assets Measured at    HTML     62K 
                Fair Value Based on NAV Per Share (Details)                      
90: R73         Retirement Plans - Schedule of Health Care Cost     HTML     52K 
                Trend Rates (Details)                                            
91: R74         Income Taxes (Details)                              HTML     81K 
92: R75         Income Taxes - Additional Information (Details)     HTML     92K 
93: R76         Income Taxes Effective Tax Rate Reconciliation      HTML     80K 
                (Details)                                                        
94: R77         Income Taxes Deferred Taxes (Details)               HTML     90K 
95: R78         Income Taxes Valuation Allowance Against Deferred   HTML     48K 
                Tax Assets (Details)                                             
96: R79         Income Taxes Unrecognized Tax Benefit (Details)     HTML     57K 
97: R80         Segment Information - Additional Information        HTML    105K 
                (Details)                                                        
98: R81         Segment Information - Schedule of Revenue from      HTML     64K 
                External Customers, Segment Income and Long-Lived                
                Assets, by Geographical Areas (Details)                          
99: R82         Segment Information - Certain Financial Data for    HTML    172K 
                Segments (Details)                                               
100: R83         Segment Information - Changes in Carrying Amount    HTML     88K  
                of Goodwill (Details)                                            
101: R84         Interest - Summary of Components of Interest        HTML     46K  
                Expense, Net (Details)                                           
102: R85         Interest - Additional Information (Details)         HTML     44K  
103: R86         Inventories - Schedule of Inventories (Details)     HTML     52K  
104: R87         Inventories - Additional Information (Details)      HTML     41K  
105: R88         Property, Plant and Equipment - Schedule of         HTML     61K  
                Property, Plant and Equipment (Details)                          
106: R89         Property, Plant and Equipment - Schedule of         HTML     46K  
                Property, Plant and Equipment (Parenthetical)                    
                (Details)                                                        
107: R90         Property, Plant and Equipment - Additional          HTML     44K  
                Information (Details)                                            
108: R91         Other Intangible Assets - Schedule of Gross         HTML     64K  
                Carrying Amount and Accumulated Amortization                     
                Relating to Intangible Assets, Excluding Goodwill                
                (Details)                                                        
109: R92         Other Intangible Assets - Estimated Intangible      HTML     51K  
                Asset Amortization Expense (Details)                             
110: R93         Other Intangible Assets - Additional Information    HTML     44K  
                (Details)                                                        
111: R94         Fair Value - Additional Information (Details)       HTML     64K  
112: R95         Fair Value - Summary of Accounts Receivable Sales   HTML     47K  
                Agreements (Details)                                             
113: R96         Debt - Schedule of Carrying Value and Weighted      HTML     70K  
                Average Interest Rate of Individual Components of                
                Debt (Details)                                                   
114: R97         Debt - Additional Information (Details)             HTML    386K  
115: R98         Debt - Schedule of Aggregate Maturities of Debt     HTML     64K  
                (Details)                                                        
116: R99         Leases - Schedule of Components of Lease Costs      HTML     55K  
                (Details)                                                        
117: R100        Leases - Summary of Supplemental Balance Sheet      HTML     71K  
                Information Related to Leases (Details)                          
118: R101        Leases - Summary of Lease Term and Discount Rate    HTML     51K  
                (Details)                                                        
119: R102        Leases - Summary of Supplemental Cash Flow          HTML     51K  
                Information Related to Leases (Details)                          
120: R103        Leases - Summary of Maturity of Lease Liabilities   HTML     98K  
                (Details)                                                        
121: R104        Special Purpose Entities - Additional Information   HTML     57K  
                (Details)                                                        
122: R105        Related Party Transactions - Additional             HTML     51K  
                Information (Details)                                            
123: R106        Commitments and Contingencies - Additional          HTML    100K  
                Information (Details)                                            
124: R107        Accumulated Other Comprehensive Loss and Other      HTML     67K  
                Comprehensive Income (Loss) - Additional                         
                Information (Details)                                            
125: R108        Accumulated Other Comprehensive Loss and Other      HTML     72K  
                Comprehensive Income (Loss) - Schedule of Changes                
                in Accumulated Other Comprehensive Loss, Net of                  
                Tax (Details)                                                    
126: R109        Accumulated Other Comprehensive Loss and Other      HTML    101K  
                Comprehensive Income (Loss) - Summary of                         
                Reclassification out of Accumulated Other                        
                Comprehensive Loss (Details)                                     
127: R110        Accumulated Other Comprehensive Loss and Other      HTML    138K  
                Comprehensive Income (Loss) - Schedule of Other                  
                Comprehensive Income (Loss) (Details)                            
128: R111        Stockholders' Equity - Additional Information       HTML     51K  
                (Details)                                                        
129: R112        Share-Based Compensation - Additional Information   HTML     81K  
                (Details)                                                        
130: R113        Share-Based Compensation - Summary of Changes in    HTML     71K  
                Stock Options (Details)                                          
131: R114        Share-Based Compensation - Restricted Stock and     HTML     93K  
                Restricted Stock Units - Additional Information                  
                (Details)                                                        
132: R115        Share-Based Compensation - Summary of Changes in    HTML     68K  
                Restricted Stock (Details)                                       
133: R116        Share-Based Compensation - Summary of Changes in    HTML     50K  
                Restricted Stock (Parenthetical) (Details)                       
134: R117        Share-Based Compensation - Summary of Restricted    HTML     70K  
                Stock Shares Granted (Details)                                   
135: R118        Share-Based Compensation - Summary of Restricted    HTML     65K  
                Stock Shares Granted (Parenthetical) (Details)                   
136: R119        Share-Based Compensation - Summary of Restricted    HTML     46K  
                Stock Awards - Vested and Released, Granted and                  
                Changes (Details)                                                
137: R120        Share-Based Compensation - Employee Stock Purchase  HTML     53K  
                Plan - Additional Information (Details)                          
138: R121        Earnings per Share - Schedule of Earnings Per       HTML     87K  
                Share, Basic and Diluted (Details)                               
139: R122        Earnings per Share - Additional Information         HTML     42K  
                (Details)                                                        
140: R123        Subsequent Events - Additional Information          HTML     54K  
                (Details)                                                        
143: XML         IDEA XML File -- Filing Summary                      XML    276K  
141: XML         XBRL Instance -- wrk-20220930_htm                    XML  12.87M  
142: EXCEL       IDEA Workbook of Financial Reports                  XLSX    369K  
13: EX-101.CAL  XBRL Calculations -- wrk-20220930_cal                XML    429K 
15: EX-101.DEF  XBRL Definitions -- wrk-20220930_def                 XML   1.60M 
14: EX-101.LAB  XBRL Labels -- wrk-20220930_lab                      XML   3.04M 
17: EX-101.PRE  XBRL Presentations -- wrk-20220930_pre               XML   2.36M 
16: EX-101.SCH  XBRL Schema -- wrk-20220930                          XSD    451K 
144: JSON        XBRL Instance as JSON Data -- MetaLinks              855±  1.42M  
145: ZIP         XBRL Zipped Folder -- 0000950170-22-025444-xbrl      Zip   1.28M

‘EX-101.LAB’   —   XBRL Labels — wrk-20220930_lab

This Exhibit is an XBRL XML File.

                                                                                                                                                                                
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<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="us-gaap_DerivativeInstrumentRiskAxis"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets" xlink:label="us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets"/>
<link:loc xlink:type="locator" xlink:href="wrk-20220930.xsd#wrk_SellingGeneralAndAdministrativeExpenseExcludingIntangibleAmortization" xlink:label="wrk_SellingGeneralAndAdministrativeExpenseExcludingIntangibleAmortization"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock" xlink:label="us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationAllowancesAndReservesReservesOfBusinessesAcquired" xlink:label="us-gaap_ValuationAllowancesAndReservesReservesOfBusinessesAcquired"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember" xlink:label="us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember"/>
<link:loc xlink:type="locator" xlink:href="wrk-20220930.xsd#wrk_ManufacturingOperationsAnnualCapacity" xlink:label="wrk_ManufacturingOperationsAnnualCapacity"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments" xlink:label="us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="us-gaap_DebtInstrumentLineItems"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="us-gaap_LongtermDebtTypeDomain"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:label="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestIncomeAndInterestExpenseDisclosureTableTextBlock" xlink:label="us-gaap_InterestIncomeAndInterestExpenseDisclosureTableTextBlock"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets" xlink:label="us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets"/>
<link:loc xlink:type="locator" xlink:href="wrk-20220930.xsd#wrk_LeasesLiabilitiesTextBlock" xlink:label="wrk_LeasesLiabilitiesTextBlock"/>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Redeemable Noncontrolling Interest, Equity, Carrying Amount, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Redeemable noncontrolling interests </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Redeemable Noncontrolling Interest, Equity, Carrying Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressCityOrTown_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Entity Address, City or Town </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressCityOrTown_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Entity Address, City or Town </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeSeveranceMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Severance and Other Employee Costs [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeSeveranceMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Employee Severance [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LineOfCreditFacilityAmountOfIncrementalDrawdowns_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Amount of incremental drawdowns </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LineOfCreditFacilityAmountOfIncrementalDrawdowns_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Line Of Credit Facility Amount Of Incremental Drawdowns </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LineOfCreditFacilityAmountOfIncrementalDrawdowns_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Line of credit facility amount of incremental drawdowns. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule of Effective Income Tax Rate Reconciliation </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Distributed and undistributed income (loss) available to common stockholders, Basic </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Net Income (Loss) Available to Common Stockholders, Basic </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueDisclosuresAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Fair Value Disclosures [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromLifeInsurancePolicies_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Proceeds from corporate owned life insurance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromLifeInsurancePolicies_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Proceeds from Life Insurance Policy </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> New Accounting Pronouncements Or Change In Accounting Principle [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Accounting Standards Update and Change in Accounting Principle [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Defined Benefit Plan, Target Allocation Percentage of Assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Plan Assets, Target Allocation, Percentage </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Earnings Per Share [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueInputsLevel1Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Fair Value, Inputs, Level 1 [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueInputsLevel1Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Fair Value, Inputs, Level 1 [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DueFromRelatedPartiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Due from Related Parties, Current, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DueFromRelatedPartiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Accounts receivable due from affiliated companies </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DueFromRelatedPartiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Due from Related Parties, Current </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ScheduleOfRestructuringAndRelatedCostsAndOtherCostsTextBlockTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule of Restructuring and Other Costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ScheduleOfRestructuringAndRelatedCostsAndOtherCostsTextBlockTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule Of Restructuring And Related Costs And Other Costs Text Block Table [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ScheduleOfRestructuringAndRelatedCostsAndOtherCostsTextBlockTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Schedule of restructuring and related costs and other costs. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LegacyReportableConsumerPackagingSegmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Legacy Reportable Consumer Packaging Segment [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LegacyReportableConsumerPackagingSegmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Legacy reportable consumer packaging segment. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Finance Leases, Fiscal 2025 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Finance Lease, Liability, to be Paid, Year Three </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Notional amount of natural gas derivatives </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Derivative, Nonmonetary Notional Amount, Energy Measure </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsGrossAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Deferred income tax assets: </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsGrossAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax Assets, Gross [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Assets Held for Sale [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Disposal Group, Held-for-sale, Not Discontinued Operations [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Disposal Group, Held-for-sale, Not Discontinued Operations [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_FavorableContractsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Favorable Contracts [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_FavorableContractsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Favorable Contracts [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_FavorableContractsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Favorable contracts. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Financing activities: </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Net Cash Provided by (Used in) Financing Activities [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OperatingAndFinanceLeaseLiabilityMaturityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Summary of Maturity of Lease Liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OperatingAndFinanceLeaseLiabilityMaturityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating And Finance Lease Liability Maturity Table [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OperatingAndFinanceLeaseLiabilityMaturityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Operating and finance lease liability maturity table. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Dividend yield </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ReportingUnitAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Reporting Unit </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ReportingUnitAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Reporting Unit [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_EatonINAndAuroraILMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Eaton, IN, and Aurora, IL [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_EatonINAndAuroraILMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Eaton, I N and Aurora I L [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_EatonINAndAuroraILMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Eaton, IN, and aurora, IL. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LongtermDebtExcludingFinanceLeaseObligationsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Long-term Debt, Excluding Finance Lease Obligations [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LongtermDebtExcludingFinanceLeaseObligationsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Longterm Debt Excluding Finance Lease Obligations [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LongtermDebtExcludingFinanceLeaseObligationsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Longterm debt excluding finance lease obligations. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NotesDueFiscal2029To2033Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Notes Due Fiscal 2029 to 2033 [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NotesDueFiscal2029To2033Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Notes Due Fiscal2029 To2033 [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NotesDueFiscal2029To2033Member_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Notes due fiscal 2029 to 2033. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AmendmentFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Amendment Flag </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AmendmentFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Amendment Flag </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Aggregate fair value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Fiscal 2026 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Long-Term Debt, Maturity, Year Four </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SpecialPurposeEntitiesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Special Purpose Entities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SpecialPurposeEntitiesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Special Purpose Entities [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SpecialPurposeEntitiesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Special Purpose Entities [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_GoodwillSegmentRecasting_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Segment recasting </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_GoodwillSegmentRecasting_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Goodwill Segment Recasting </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_GoodwillSegmentRecasting_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Goodwill segment recasting. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Shares available for Issuance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_EuropeanRevolvingCreditFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> European Revolving Credit Facility [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_EuropeanRevolvingCreditFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> European Revolving Credit Facility [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_EuropeanRevolvingCreditFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> European revolving credit facility [Member]. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Subsequent Event Type [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OtherCostsRelatedToRestructuringAndOtherCostsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Other Restructuring Costs [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OtherCostsRelatedToRestructuringAndOtherCostsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Costs Related To Restructuring And Other Costs [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OtherCostsRelatedToRestructuringAndOtherCostsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Other costs related to restructuring and other costs. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Less: Distributed and undistributed income available to participating securities, Diluted </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Participating Securities, Distributed and Undistributed Earnings (Loss), Diluted </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ExtinguishmentOfDebtAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Extinguishment of Debt </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ExtinguishmentOfDebtAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Extinguishment of Debt [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Accumulated Amortization </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Finite-Lived Intangible Assets, Accumulated Amortization </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NewReportableGlobalPaperSegmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> New Reportable Global Paper Segment [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NewReportableGlobalPaperSegmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> New reportable global paper segment. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ScheduleOfRestructuringCostsIncludedInOtherExpensesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule of Acquisition, Integration and Divestiture Costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ScheduleOfRestructuringCostsIncludedInOtherExpensesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule Of Restructuring Costs Included In Other Expenses Table [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ScheduleOfRestructuringCostsIncludedInOtherExpensesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Schedule of restructuring costs included in other expenses. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CostOfSalesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Cost of Goods Sold [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CostOfSalesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Cost of Sales [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SeniorNotesDueTwoThousandAndTwentyFourMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Senior Notes due 2024 [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SeniorNotesDueTwoThousandAndTwentyFourMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Senior Notes Due Two Thousand And Twenty Four [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SeniorNotesDueTwoThousandAndTwentyFourMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Senior notes due two thousand and twenty four. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Goodwill_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Goodwill, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Goodwill_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Goodwill </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Goodwill_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel"> Goodwill, beginning of fiscal year </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Goodwill_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Goodwill, end of fiscal year </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Goodwill_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Goodwill </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredIncomeTaxAssetsNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Long-term deferred tax asset </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredIncomeTaxAssetsNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Income Tax Assets, Net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SeniorNotesDueTwoThousandAndThirtyTwoMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Senior Notes due 2032 [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SeniorNotesDueTwoThousandAndThirtyTwoMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Senior Notes Due Two Thousand And Thirty Two [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SeniorNotesDueTwoThousandAndThirtyTwoMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Senior notes due two thousand and thirty two. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquityAmortizablePortion_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Equity Method Investment, Difference Between Carrying Amount and Underlying Equity, Amortizable Portion </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquityAmortizablePortion_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Equity Method Investment Difference Between Carrying Amount And Underlying Equity Amortizable Portion </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquityAmortizablePortion_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Equity method investment, difference between carrying amount and underlying equity, amortizable portion. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseRightOfUseAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Operating lease right-of-use asset </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseRightOfUseAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> ROU assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseRightOfUseAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating Lease, Right-of-Use Asset </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DomesticCorporateDebtSecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> US Corporate Bonds [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DomesticCorporateDebtSecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt Security, Corporate, US [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule of Gross Carrying Amount and Accumulated Amortization Relating to Intangible Assets, Excluding Goodwill </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Finite-Lived Intangible Assets [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OtherComprehensiveIncomeLossAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Comprehensive Income Loss [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OtherComprehensiveIncomeLossAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Other Comprehensive Income (Loss) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_IssuanceOfSharesEstimatedUponPerformanceOfOutstandingGrantsToBeAttainedAtLevels_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Issuance of additional shares estimated upon performance of aggregate outstanding grants to be attained at levels </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_IssuanceOfSharesEstimatedUponPerformanceOfOutstandingGrantsToBeAttainedAtLevels_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Issuance Of Shares Estimated Upon Performance Of Outstanding Grants To Be Attained At Levels </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_IssuanceOfSharesEstimatedUponPerformanceOfOutstandingGrantsToBeAttainedAtLevels_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Issuance of shares estimated upon performance of outstanding grants to be attained at levels. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockTotalShareholderReturnGrantMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Restricted Stock, Total Shareholder Return Grant [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockTotalShareholderReturnGrantMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restricted Stock Total Shareholder Return Grant [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockTotalShareholderReturnGrantMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Restricted stock total shareholder return grant. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_MaximumEligibleReceivablesThatMayBeSold_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Maximum eligible receivables that may be sold </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_MaximumEligibleReceivablesThatMayBeSold_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Maximum Eligible Receivables That May Be Sold </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_MaximumEligibleReceivablesThatMayBeSold_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Maximum eligible receivables that may be sold. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> State net operating loss carryforwards </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax Assets, Operating Loss Carryforwards, State and Local </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_BusinessCombinationConsiderationToBeTransferred_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Purchase consideration to be transferred </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_BusinessCombinationConsiderationToBeTransferred_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Business Combination Consideration To Be Transferred </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_BusinessCombinationConsiderationToBeTransferred_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Business combination consideration to be transferred. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FixedIncomeSecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Fixed Income Securities [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FixedIncomeSecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Fixed Income Securities [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_CloudComputingArrangementsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Cloud Computing Arrangements </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_CloudComputingArrangementsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Cloud Computing Arrangements Policy Text Block </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_CloudComputingArrangementsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Cloud computing arrangements policy text block. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_VariableAndShortTermLeaseCost_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Variable and short-term lease costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_VariableAndShortTermLeaseCost_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Variable And Short Term Lease Cost </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_VariableAndShortTermLeaseCost_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Variable and short term lease cost. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Debt Instrument [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Long-Term Debt Instruments [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LoansReceivableBasisSpreadOnVariableRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Credit facility basis spread on floating rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LoansReceivableBasisSpreadOnVariableRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Loans Receivable, Basis Spread on Variable Rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_IssuancesOfCommonStockNetOfRelatedTaxWithholdings_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Issuances of common stock, net of related tax withholdings </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_IssuancesOfCommonStockNetOfRelatedTaxWithholdings_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Issuances Of Common Stock Net Of Related Tax Withholdings </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_IssuancesOfCommonStockNetOfRelatedTaxWithholdings_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Issuances of common stock, net of related tax withholdings. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsForRepurchaseOfCommonStock_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Purchases of common stock </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsForRepurchaseOfCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Payments for Repurchase of Common Stock </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedTranslationAdjustmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Accumulated Translation Adjustment [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedTranslationAdjustmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Accumulated Foreign Currency Adjustment Attributable to Parent [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Reclassification adjustment of net loss on cash flow hedges included in earnings, Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OtherAdjustments_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Other adjustments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OtherAdjustments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Other adjustments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OtherAdjustments_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Adjustments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OtherAdjustments_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Adjustments reflected in Adjusted EBITDA </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ValuationAllowancesAndReservesDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> SEC Schedule, 12-09, Valuation Allowances and Reserves </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ValuationAllowancesAndReservesDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Operating Leases, Less: Interest </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Lessee, Operating Lease, Liability, Undiscounted Excess Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SegmentReportingInformationSegmentIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Segment income </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SegmentReportingInformationSegmentIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Segment income </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SegmentReportingInformationSegmentIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Segment Reporting Information Segment Income </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SegmentReportingInformationSegmentIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Segment reporting information, segment income. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LongTermCommittedCreditFacilitiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Long-Term Committed Credit Facilities [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LongTermCommittedCreditFacilitiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Long Term Committed Credit Facilities [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LongTermCommittedCreditFacilitiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Long term committed credit facilities. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquityMethodInvestments_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Equity method investments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquityMethodInvestments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Equity Method Investments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquityMethodInvestments_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Equity Method Investments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Statement [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Statement [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiabilityNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Noncurrent operating lease liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiabilityNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating Lease, Liability, Noncurrent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Finance Leases, Fiscal 2023 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Finance Lease, Liability, to be Paid, Year One </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ShareBasedCompensationArrangementsByShareBasedPaymentAwardPlanNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Share Based Compensation Arrangements By Share Based Payment Award Plan Name </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ShareBasedCompensationArrangementsByShareBasedPaymentAwardPlanNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share Based Compensation Arrangements By Share Based Payment Award Plan Name [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ShareBasedCompensationArrangementsByShareBasedPaymentAwardPlanNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Share-based compensation arrangements by share-based payment award, plan name. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseInterestExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Interest on lease liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseInterestExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Finance Lease, Interest Expense </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossTax_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Consolidated other comprehensive (loss) income, Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Comprehensive Income (Loss), Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Unrecognized Tax Benefits that Would Impact Effective Tax Rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Unrecognized Tax Benefits that Would Impact Effective Tax Rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedAssetsHeldBySpecialPurposeEntities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Restricted assets held by special purpose entities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedAssetsHeldBySpecialPurposeEntities_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restricted Assets Held By Special Purpose Entities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedAssetsHeldBySpecialPurposeEntities_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Restricted assets held by special purpose entities. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ChangeInAccountingPrincipleAccountingStandardsUpdateImmaterialEffect_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ScheduleOfShareBasedCompensationArrangementByShareBasedPlanNameAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule Of Share Based Compensation Arrangement By Share Based Plan Name </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ScheduleOfShareBasedCompensationArrangementByShareBasedPlanNameAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule Of Share Based Compensation Arrangement By Share Based Plan Name [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ScheduleOfShareBasedCompensationArrangementByShareBasedPlanNameAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Schedule of share-based compensation arrangement by share-based plan name. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Other Postretirement Benefits Plan [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Postretirement Benefits Plan [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LitigationStatusAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Litigation Status </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LitigationStatusAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Litigation Status [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeasePayments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Operating cash flows related to operating leases </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeasePayments_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating Lease, Payments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Stock Issued During Period, Shares, Employee Stock Purchase Plans </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Stock Issued During Period, Shares, Employee Stock Purchase Plans </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AllOtherSegmentsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Other Segments [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AllOtherSegmentsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Segments [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LondonInterbankOfferedRateLIBORMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> LIBOR [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LondonInterbankOfferedRateLIBORMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> London Interbank Offered Rate (LIBOR) [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherNoncurrentLiabilitiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Other Long Term Liabilities [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherNoncurrentLiabilitiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Noncurrent Liabilities [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Preferred Stock, Shares Outstanding, Ending Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel"> Preferred Stock, Shares Outstanding, Beginning Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Preferred Stock, Shares Outstanding </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Preferred Stock, Shares Outstanding </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Business Acquisition </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Business Acquisition [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Accumulated Other Comprehensive Income Loss [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Accumulated Other Comprehensive Income (Loss) [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MachineryAndEquipmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Machinery and Equipment [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MachineryAndEquipmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Machinery and Equipment [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestructuringAndOtherCostsNetSeveranceAndOtherEmployeeCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Severance and other employee costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestructuringAndOtherCostsNetSeveranceAndOtherEmployeeCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restructuring And Other Costs Net Severance And Other Employee Costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestructuringAndOtherCostsNetSeveranceAndOtherEmployeeCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Severance and Other Employee Costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsOfDividendsCommonStock_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Cash dividends paid to stockholders </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsOfDividendsCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Payments of Ordinary Dividends, Common Stock </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NonUsEquitySecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Non US Equity Securities [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NonUsEquitySecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Non Us Equity Securities [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NonUsEquitySecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Non-U S equity securities. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AuditorFirmId_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Auditor Firm ID </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel"> Weighted Average Grant Date Fair Value, Outstanding </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Weighted Average Grant Date Fair Value, Outstanding </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Weighted Average Grant Date Fair Value, Vested and released </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LandAndDevelopmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Land and Development [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LandAndDevelopmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Land And Development [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LandAndDevelopmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Land and development. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PaceIndustryUnionManagementPensionFundMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Pace Industry Union Management Pension Fund [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PaceIndustryUnionManagementPensionFundMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Pace Industry Union Management Pension Fund [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PaceIndustryUnionManagementPensionFundMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Pace Industry Union-Management Pension Fund (PIUMPF). </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsToAcquireProductiveAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Payments to Acquire Productive Assets, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsToAcquireProductiveAssets_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Capital expenditures </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsToAcquireProductiveAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Capital expenditures </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsToAcquireProductiveAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Payments to Acquire Productive Assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Acquisitions and Investments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Business Combination Disclosure [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxAuthorityDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Income Tax Authority </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxAuthorityDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Income Tax Authority [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsTaxCreditCarryforwards_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Deferred Tax Assets, Tax Credit Carryforwards, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsTaxCreditCarryforwards_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Tax Credit Carryforward, Deferred Tax Asset </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsTaxCreditCarryforwards_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax Assets, Tax Credit Carryforwards </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OperatingAndFinanceLeaseLiabilityPaymentsDueYearThree_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Fiscal 2025 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OperatingAndFinanceLeaseLiabilityPaymentsDueYearThree_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating And Finance Lease Liability Payments Due Year Three </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OperatingAndFinanceLeaseLiabilityPaymentsDueYearThree_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Amount of lessee's undiscounted obligation for lease payments for operating and finance lease, due in third fiscal year following latest fiscal year. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Fiscal 2026 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Expected Future Benefit Payment, Year Four </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Employee Service Share-based Compensation, Tax Benefit from Compensation Expense </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Payment Arrangement, Expense, Tax Benefit </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountingStandardsUpdate201912Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Accounting Standards Update 2019-12 [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_HedgingRelationshipDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Hedging Relationship [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_InternationalAndOtherDebtMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> International and Other Debt [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_InternationalAndOtherDebtMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> International And Other Debt [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_InternationalAndOtherDebtMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> International and other debt. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnusualOrInfrequentItemInsuranceProceeds_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Insurance proceeds related to extensive damage </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnusualOrInfrequentItemInsuranceProceeds_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Unusual or Infrequent Item, or Both, Insurance Proceeds </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FixedIncomeFundsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Fixed Income Investments [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FixedIncomeFundsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Fixed Income Funds [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ReportingUnitGrowthRate_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Reporting unit, growth rate. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ReportingUnitGrowthRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Reporting unit, growth rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ReportingUnitGrowthRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Reporting Unit Growth Rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Adoption of Accounting Standards [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Cumulative Effect, Period of Adoption, Adjustment [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel"> Total Reclassifications From Other Comprehensive Income Net of Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherInvestmentsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Other Investments [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherInvestmentsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Investments [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetUsefulLife_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Weighted Avg. Life (in years) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetUsefulLife_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Finite-Lived Intangible Assets, Useful Life </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetUsefulLife_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Finite-Lived Intangible Asset, Useful Life </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetirementPlanTaxStatusAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Retirement Plan Tax Status </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetirementPlanTaxStatusAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Retirement Plan Tax Status [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeRelatedLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Employee-related Liabilities, Current, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeRelatedLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Accrued compensation and benefits </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeRelatedLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Employee-related Liabilities, Current </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisposalGroupClassificationDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Disposal Group Classification </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisposalGroupClassificationDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Disposal Group Classification [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_IncreaseDecreaseInAccountsReceivableFromTransfersNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Cash proceeds from financial institutions </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_IncreaseDecreaseInAccountsReceivableFromTransfersNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Increase Decrease In Accounts Receivable From Transfers Net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_IncreaseDecreaseInAccountsReceivableFromTransfersNet_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Increase decrease in accounts receivable from transfers net. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeStockOptionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Stock Options [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeStockOptionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Payment Arrangement, Option [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Operating leases </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating Lease, Weighted Average Remaining Lease Term </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Amounts reclassified from accumulated other comprehensive loss </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Total liabilities and equity </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Liabilities and Equity </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InventoryPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Inventories </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InventoryPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Inventory, Policy [Policy Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DeferredTaxLiabilitiesRightOfUseAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Right-of-use assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DeferredTaxLiabilitiesRightOfUseAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax Liabilities Right Of Use Assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DeferredTaxLiabilitiesRightOfUseAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Deferred tax liabilities right-of-use assets. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Prepaid pension asset </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Assets for Plan Benefits, Defined Benefit Plan </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PriorPeriodReclassificationAdjustmentDescription_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Reclassifications and Adjustments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PriorPeriodReclassificationAdjustmentDescription_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Reclassification, Comparability Adjustment [Policy Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Other current liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Liabilities, Current </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LineOfCreditFacilityLenderDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Line of Credit Facility, Lender </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LineOfCreditFacilityLenderDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Line of Credit Facility, Lender [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DisclosureAcquisitionsAndInvestmentAdditionalInformationDetailsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Disclosure Acquisitions And Investment Additional Information Details [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DisclosureAcquisitionsAndInvestmentAdditionalInformationDetailsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Disclosure acquisitions and investment additional information details. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedPeriodStartLabel"> Accumulated impairment losses, beginning of period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedPeriodEndLabel"> Accumulated impairment losses, end of period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Goodwill, Impaired, Accumulated Impairment Loss </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MovementInValuationAllowancesAndReservesRollForward_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Movement in Valuation Allowances and Reserves [Roll Forward] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MovementInValuationAllowancesAndReservesRollForward_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SharebasedCompensationArrangementBySharebasedPaymentAwardStocksAppreciationRightsOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Share-based Compensation Arrangement by Share-based Payment Award, Stock Appreciation Rights, Outstanding </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SharebasedCompensationArrangementBySharebasedPaymentAwardStocksAppreciationRightsOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Sharebased Compensation Arrangement by Sharebased Payment Award Stocks Appreciation Rights Outstanding </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SharebasedCompensationArrangementBySharebasedPaymentAwardStocksAppreciationRightsOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Sharebased compensation arrangement by sharebased payment award stocks appreciation rights outstanding. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_COVIDPandemicTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> COVID Pandemic </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_COVIDPandemicTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> C O V I D Pandemic [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_COVIDPandemicTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> COVID pandemic related disclosure. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestructuringAndOtherCostsNet_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Restructuring and other costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestructuringAndOtherCostsNet_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Restructuring and Other Costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestructuringAndOtherCostsNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Restructuring and other costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestructuringAndOtherCostsNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restructuring And Other Costs Net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestructuringAndOtherCostsNet_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Amount charged against earnings in the period for incurred and estimated costs, excluding asset retirement obligations, associated with exit from or disposal of business activities or restructurings pursuant to a program that is planned and controlled by management, and materially changes either the scope of a business undertaken by an entity, or the manner in which that business is conducted and other costs including but not limited to asset impairments, acquisition and integration costs. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SegmentReportingInformationPercentageOfLongLivedAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Percentage of Long-Lived Assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SegmentReportingInformationPercentageOfLongLivedAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Segment Reporting Information Percentage Of Long Lived Assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SegmentReportingInformationPercentageOfLongLivedAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Segment reporting information, percentage of long-lived assets. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InventoryRawMaterials_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Raw materials </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InventoryRawMaterials_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Inventory, Raw Materials, Gross </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredForeignIncomeTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Foreign </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredForeignIncomeTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Foreign Income Tax Expense (Benefit) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ChangeInAccountingPrincipleAccountingStandardsUpdateAdopted_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Change in Accounting Principle, Accounting Standards Update, Adopted [true false] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PledgedStatusDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Pledged Status [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Foreign currency translation (loss) gain, Net of Tax Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Foreign currency translation (loss) gain </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Derivative liabilities current, fair value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Derivative Liability, Current </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityIncorporationStateCountryCode_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Entity Incorporation, State or Country Code </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityIncorporationStateCountryCode_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Entity Incorporation, State or Country Code </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeStatementAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Income Statement [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_GrupoGondiInvestmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Grupo Gondi Investment [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_GrupoGondiInvestmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Grupo Gondi Investment [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_GrupoGondiInvestmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Grupo Gondi Investment. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SeniorNotesDueJuneTwoThousandAndTwentyEightMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Senior Notes due June 2028 [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SeniorNotesDueJuneTwoThousandAndTwentyEightMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Senior Notes Due June Two Thousand And Twenty Eight [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SeniorNotesDueJuneTwoThousandAndTwentyEightMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Senior Notes due June 2028. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Finance leases </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Finance Lease, Weighted Average Remaining Lease Term </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockSubsequentGrantMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Restricted Stock, Subsequent Grant [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockSubsequentGrantMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restricted Stock Subsequent Grant [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockSubsequentGrantMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Restricted stock, subsequent grant. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingSegmentsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Operating Segments [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingSegmentsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating Segments [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RatioOfKapStoneSharesToWestRockShares_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Ratio of KapStone Shares to WestRock Shares </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RatioOfKapStoneSharesToWestRockShares_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Ratio Of Kap Stone Shares To West Rock Shares </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RatioOfKapStoneSharesToWestRockShares_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Ratio of KapStone shares to WestRock shares. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Current finance lease liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Finance Lease, Liability, Current </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NumberOfCountries_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Number of countries </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NumberOfCountries_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Number Of Countries </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NumberOfCountries_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Number of countries. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Net actuarial (loss) gain arising during period, Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Total current liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Liabilities, Current </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerAssetNetCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Contract with Customer, Asset, after Allowance for Credit Loss, Current, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerAssetNetCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel"> Short-Term Contract Assets, Beginning balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerAssetNetCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Short-Term Contract Assets, Ending balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerAssetNetCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Contract with Customer, Asset, after Allowance for Credit Loss, Current </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_BusinessInterruptionRecoveriesAsReductionOfCostOfGoodsSold_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Business interruption recoveries as reduction of Cost of goods sold. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_BusinessInterruptionRecoveriesAsReductionOfCostOfGoodsSold_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Business interruption recoveries as reduction of Cost of goods sold. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_MultiemployerAndOtherPlansPeriodCost_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Multiemployer and other plans </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_MultiemployerAndOtherPlansPeriodCost_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Multiemployer And Other Plans Period Cost </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_MultiemployerAndOtherPlansPeriodCost_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Multiemployer and other plans, period cost. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationsPolicy_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Business Combinations </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationsPolicy_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Business Combinations Policy [Policy Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLossCarryforwards_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Operating Loss Carryforwards </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLossCarryforwards_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating Loss Carryforwards </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Operating Leases, Fiscal 2025 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Lessee, Operating Lease, Liability, to be Paid, Year Three </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SupplementalBalanceSheetInformationRelatedToLeasesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Summary of Supplemental Balance Sheet Information Related to Leases </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SupplementalBalanceSheetInformationRelatedToLeasesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Supplemental Balance Sheet Information Related To Leases Table [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SupplementalBalanceSheetInformationRelatedToLeasesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Supplemental balance sheet information related to leases. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Fiscal 2027 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Long-Term Debt, Maturity, Year Five </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Less: Comprehensive income attributable to noncontrolling interests </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionAcquireeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Business Acquisition, Acquiree </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionAcquireeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Business Acquisition, Acquiree [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareInvestmentRedemptionNoticePeriod1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Notice Period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareInvestmentRedemptionNoticePeriod1_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Notice Period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLossCarryforwardsExpirationDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Operating loss carryforward expiration </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLossCarryforwardsExpirationDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating Loss Carryforwards, Expiration Date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueMeasurementsRecurringMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Fair Value, Measurements, Recurring [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueMeasurementsRecurringMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Fair Value, Recurring [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Interest Expense, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestExpense_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Interest expense </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Interest Expense </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DefinedBenefitPlanAssumptionsUsedMinimumOutstandingParValueOfBondsUsedToDetermineFutureDiscountRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Defined Benefit Plan, Assumptions Used, Minimum Outstanding Par Value of Bonds Used to Determine Future Discount Rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DefinedBenefitPlanAssumptionsUsedMinimumOutstandingParValueOfBondsUsedToDetermineFutureDiscountRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan Assumptions Used Minimum Outstanding Par Value Of Bonds Used To Determine Future Discount Rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DefinedBenefitPlanAssumptionsUsedMinimumOutstandingParValueOfBondsUsedToDetermineFutureDiscountRate_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Defined benefit plan, assumptions used, minimum outstanding par value of bonds used to determine future discount rate for defined benefit employee plans. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestructuringAndOtherCostsReserveSettledWithCash_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Payments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestructuringAndOtherCostsReserveSettledWithCash_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restructuring And Other Costs Reserve Settled With Cash </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestructuringAndOtherCostsReserveSettledWithCash_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Restructuring and other costs reserve settled with cash. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_WithholdingTaxes_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Withholding taxes </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_WithholdingTaxes_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Withholding Taxes </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_WithholdingTaxes_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Withholding taxes. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Income Taxes </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Income Tax, Policy [Policy Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel"> Amortization of prior service cost, Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Amortization of prior service credits (costs), Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainOnBusinessInterruptionInsuranceRecovery_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Insurance proceeds from business interruption recoveries </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainOnBusinessInterruptionInsuranceRecovery_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Gain on Business Interruption Insurance Recovery </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInContractWithCustomerLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> (Decrease) / increase in Short-Term Contract Liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInContractWithCustomerLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Increase (Decrease) in Contract with Customer, Liability </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfHealthCareCostTrendRatesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule of Health Care Cost Trend Rates </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfHealthCareCostTrendRatesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Health Care Cost Trend Rates [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockServiceConditionAndAReturnOnInvestedCapitalPerformanceConditionAtTargetMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Restricted Stock Service Condition And A Return On Invested Capital Performance Condition at Target [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockServiceConditionAndAReturnOnInvestedCapitalPerformanceConditionAtTargetMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restricted Stock Service Condition And A Return On Invested Capital Performance Condition at Target [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockServiceConditionAndAReturnOnInvestedCapitalPerformanceConditionAtTargetMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Restricted stock service condition and a return on invested capital performance condition at target member. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DeferredTaxAssetStateCreditCarryforwardsNetOfFederalBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> State credit carryforwards, net of federal benefit </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DeferredTaxAssetStateCreditCarryforwardsNetOfFederalBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax Asset State Credit Carryforwards Net Of Federal Benefit </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DeferredTaxAssetStateCreditCarryforwardsNetOfFederalBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Deferred tax asset, state credit carryforwards, net of federal benefit. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Long-term Purchase Commitment, Category of Item Purchased </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Long-Term Purchase Commitment, Category of Item Purchased [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Preferred Stock, Shares Authorized </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Preferred Stock, Shares Authorized </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ReclassificationFromAociCurrentPeriodTax_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Reclassification from AOCI, Current Period, Tax, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ReclassificationFromAociCurrentPeriodTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Total Reclassifications From Other Comprehensive Income Tax Portion </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ReclassificationFromAociCurrentPeriodTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Reclassification from AOCI, Current Period, Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Net deferred income tax liability </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax Liabilities, Net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Other current liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Liability, Defined Benefit Plan, Current </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestructuringAndOtherCostsReservePeriodExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Additional accruals </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestructuringAndOtherCostsReservePeriodExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restructuring And Other Costs Reserve Period Expense </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestructuringAndOtherCostsReservePeriodExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Restructuring and other costs reserve, period expense. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_HedgeFundsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Hedge Funds [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_HedgeFundsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Hedge Funds [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_CumulativeEffectPeriodOfAdoptionAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Cumulative Effect, Period of Adoption </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_CumulativeEffectPeriodOfAdoptionAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Cumulative Effect, Period of Adoption [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule of Components of Income Tax Expense </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Operating leases </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating Lease, Weighted Average Discount Rate, Percent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CorporateNonSegmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Corporate, Non-Segment [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CorporateNonSegmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Corporate, Non-Segment [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_VariableRateAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Variable Rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_VariableRateAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Variable Rate [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoption_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Adoption of accounting standards </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoption_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> New Accounting Pronouncement Or Change In Accounting Principle Effect Of Adoption </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoption_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> New accounting pronouncement or change in accounting principle effect of adoption. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_CashPaidForAmountsIncludedMeasurementOfLeaseLiabilitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Cash paid for amounts included in the measurement of lease liabilities: </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_CashPaidForAmountsIncludedMeasurementOfLeaseLiabilitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Cash Paid For Amounts Included Measurement Of Lease Liabilities [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_CashPaidForAmountsIncludedMeasurementOfLeaseLiabilitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Cash paid for amounts included in the measurement of lease liabilities. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntitySmallBusiness_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Entity Small Business </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntitySmallBusiness_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Entity Small Business </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NumberOfReportableSegments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Number of reportable segments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NumberOfReportableSegments_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Number of Reportable Segments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_FinanceLeasePropertyPlantAndEquipmentGross_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Property, plant and equipment </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_FinanceLeasePropertyPlantAndEquipmentGross_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Finance Lease Property Plant And Equipment Gross </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_FinanceLeasePropertyPlantAndEquipmentGross_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Finance lease property, plant and equipment gross. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockServiceConditionandRelativeTotalShareholderReturnMarketConditionatTargetMemberMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Restricted Stock, Service Condition and Relative Total Shareholder Return Market Condition at Target [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockServiceConditionandRelativeTotalShareholderReturnMarketConditionatTargetMemberMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restricted Stock Service Conditionand Relative Total Shareholder Return Market Conditionat Target Member [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockServiceConditionandRelativeTotalShareholderReturnMarketConditionatTargetMemberMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Restricted Stock, Service Condition and Relative Total Shareholder Return Market Condition at Target [Member] [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Stock repurchase program, remaining number of shares authorized to be repurchased </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPricePurchaseDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPricePurchaseDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Discount from Market Price, Purchase Date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IntangibleAssetsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Other Intangible Assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IntangibleAssetsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Intangible Assets Disclosure [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Hedging Relationship [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ReportingUnitDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Reporting Unit </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ReportingUnitDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Reporting Unit [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementOperatingActivitiesSegmentAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Operating Activities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementOperatingActivitiesSegmentAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating Activities [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InvestmentTypeCategorizationMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Investments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InvestmentTypeCategorizationMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Investments [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestructuringAndRelatedActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restructuring and Related Activities [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Defined Benefit Plans, Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsByGeographicalAreasTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule of Revenue from External Customers, Segment Income and Long-Lived Assets, by Geographical Areas </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsByGeographicalAreasTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Total current assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Assets, Current </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Property Plant And Equipment [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Property, Plant and Equipment [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerAssetAndLiabilityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Summary of Opening and Closing Balances of Contract Assets and Contract Liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerAssetAndLiabilityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAllocationOfPlanAssetsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule of Allocation of Plan Assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAllocationOfPlanAssetsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Allocation of Plan Assets [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Pension </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TrademarksAndTradeNamesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Trademarks and Trade Names [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TrademarksAndTradeNamesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Trademarks and Tradenames [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TrademarksAndTradeNamesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Trademarks and Trade Names [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LineOfCreditFacilityMaximumEuroDenominatedBorrowingCapacity_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Line of credit facility, maximum Euro denominated borrowing capacity </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LineOfCreditFacilityMaximumEuroDenominatedBorrowingCapacity_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Line Of Credit Facility Maximum Euro Denominated Borrowing Capacity </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LineOfCreditFacilityMaximumEuroDenominatedBorrowingCapacity_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Line of credit facility maximum euro denominated borrowing capacity. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DefinedContributionPlanEmployerContributiononBasicSalaryEmployeesCoveredunderaCBAMaximumHighEndofRange_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Defined Contribution Plan Employer Contribution on Basic Salary, Employees Covered under a CBA, Maximum, High End of Range </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DefinedContributionPlanEmployerContributiononBasicSalaryEmployeesCoveredunderaCBAMaximumHighEndofRange_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Contribution Plan Employer Contributionon Basic Salary Employees Coveredundera C B A Maximum High Endof Range </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DefinedContributionPlanEmployerContributiononBasicSalaryEmployeesCoveredunderaCBAMaximumHighEndofRange_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Defined contribution plan employer contribution on basic salary, employees covered under a CBA, maximum, high end of range. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EnvironmentalCostsPolicy_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Environmental Costs Remediation Costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EnvironmentalCostsPolicy_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Environmental Costs, Policy [Policy Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Weighted Average Number of Shares Outstanding, Basic, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Basic weighted average shares outstanding </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Weighted Average Number of Shares Outstanding, Basic </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_GlobalPaperMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Global Paper [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_GlobalPaperMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Global Paper [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_GlobalPaperMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Global paper. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Total finance lease liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Finance Leases, Present value of future lease payments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Finance Lease, Liability </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CityAreaCode_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> City Area Code </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CityAreaCode_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> City Area Code </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Aggregate Intrinsic Value, Outstanding </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfNetBenefitCostsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Summary of Components of Net Pension Income and Summary of Components of Postretirement Benefit Cost </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfNetBenefitCostsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Net Benefit Costs [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_FourZeroOneKMatchAndContributionInCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> 401(k) match and company contribution in common stock </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_FourZeroOneKMatchAndContributionInCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Four Zero One K Match And Contribution In Common Stock </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_FourZeroOneKMatchAndContributionInCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> 401(k) match and company contribution in common stock. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OperatingAndFinanceLeaseLiabilityPaymentsDueNextTwelveMonths_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Fiscal 2023 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OperatingAndFinanceLeaseLiabilityPaymentsDueNextTwelveMonths_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating And Finance Lease Liability Payments Due Next Twelve Months </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OperatingAndFinanceLeaseLiabilityPaymentsDueNextTwelveMonths_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Operating and finance lease liability payments due next twelve months. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Percentage of fee paid on unused credit facility </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Line of Credit Facility, Unused Capacity, Commitment Fee Percentage </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ComprehensiveIncomeNoteTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Accumulated Other Comprehensive Loss and Other Comprehensive Income (Loss) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ComprehensiveIncomeNoteTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Comprehensive Income (Loss) Note [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ConsumerPackagingMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Consumer Packaging [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ConsumerPackagingMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Consumer Packaging [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ConsumerPackagingMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Consumer packaging. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TransportationEquipmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Transportation Equipment [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TransportationEquipmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Transportation Equipment [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanFundedStatusOfPlan_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Funded (unfunded) status </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanFundedStatusOfPlan_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Funded (Unfunded) status </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanFundedStatusOfPlan_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Funded (Unfunded) Status of Plan </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NotesDueFiscal2037To2047Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Notes Due Fiscal 2037 to 2047 [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NotesDueFiscal2037To2047Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Notes Due Fiscal2037 To2047 [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NotesDueFiscal2037To2047Member_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Notes due fiscal 2037 to 2047. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestRateContractMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Interest Rate Contract [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestRateContractMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Interest Rate Contract [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentPeriodEndDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Document Period End Date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentPeriodEndDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Document Period End Date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="country_BR_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Brazil [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="country_BR_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> BRAZIL </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> (Loss) income attributable to noncontrolling interest </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Percent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromInsuranceSettlementInvestingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Insurance proceeds received, net cash used for investing activities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromInsuranceSettlementInvestingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Proceeds from property, plant and equipment insurance settlement </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromInsuranceSettlementInvestingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Proceeds from Insurance Settlement, Investing Activities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestrictedStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Restricted Stock [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestrictedStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restricted Stock [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockDividendsPerShareCashPaid_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Cash dividends paid per share </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockDividendsPerShareCashPaid_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Common Stock, Dividends, Per Share, Cash Paid </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RansomwareRecoveryCostsExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Ransomware recovery costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RansomwareRecoveryCostsExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Ransomware Recovery Costs Expense </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RansomwareRecoveryCostsExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Ransomware recovery costs, expense. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule Of Finite Lived Intangible Assets [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Finite-Lived Intangible Assets [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Deferred Tax Liabilities, Goodwill and Intangible Assets, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Deductible intangibles and goodwill </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax Liabilities, Goodwill and Intangible Assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DebtInstrumentBasisSpreadOnVariableRateFacilityCommitmentFee_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Facility commitment </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DebtInstrumentBasisSpreadOnVariableRateFacilityCommitmentFee_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt Instrument Basis Spread On Variable Rate Facility Commitment Fee </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DebtInstrumentBasisSpreadOnVariableRateFacilityCommitmentFee_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Debt Instrument, Basis Spread on Variable Rate, Facility Commitment Fee </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Restricted stock and options </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-Based Compensation Cost </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Description of Business and Summary of Significant Accounting Policies [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> New Accounting Pronouncements or Change in Accounting Principle [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Net retirement (income) cost </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Net Periodic Benefit Cost (Credit) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInContractWithCustomerAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> (Decrease) / Increase in Short-Term Contract Assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInContractWithCustomerAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Increase (Decrease) in Contract with Customer, Asset </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_Pensionandotherpostretirementplansliabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Pension and other postretirement plans, liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_Pensionandotherpostretirementplansliabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Pensionandotherpostretirementplansliabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_Pensionandotherpostretirementplansliabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Pension and other postretirement plans, liabilities. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Certain Financial Data for Segments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Segment Reporting Information, by Segment [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_MovementInDeferredTaxAssetValuationAllowanceRollForward_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Movement in Deferred Tax Asset Valuation Allowance [Roll Forward] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_MovementInDeferredTaxAssetValuationAllowanceRollForward_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Movement In Deferred Tax Asset Valuation Allowance Roll Forward </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_MovementInDeferredTaxAssetValuationAllowanceRollForward_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Movement in deferred tax asset valuation allowance. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TermLoanFacilitiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Term Loan Facilities [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TermLoanFacilitiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Term Loan Facilities [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TermLoanFacilitiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Term loan facilities. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Fiscal 2023 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Finite-Lived Intangible Asset, Expected Amortization, Year One </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TerminatedUnsecuredTermLoanFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Terminated Unsecured Term Loan Facility </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TerminatedUnsecuredTermLoanFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Terminated Unsecured Term Loan Facility [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TerminatedUnsecuredTermLoanFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Terminated unsecured term loan facility. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_RangeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Statistical Measurement </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_RangeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Statistical Measurement [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountingStandardsUpdate202105Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Accounting Standards Update 2021-05 [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UndistributedEarningsOfForeignSubsidiaries_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Undistributed Foreign Earnings </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UndistributedEarningsOfForeignSubsidiaries_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Undistributed Earnings of Foreign Subsidiaries </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_GainLossOnSaleOfSawmill_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Gain on sale of sawmill </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_GainLossOnSaleOfSawmill_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Gain Loss On Sale Of Sawmill </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_GainLossOnSaleOfSawmill_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> (Gain) loss on sale of sawmill. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherAssetsCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Other current assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherAssetsCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Assets, Current </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromRepaymentsOfOtherDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Other debt additions (repayments), net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromRepaymentsOfOtherDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Proceeds from (Repayments of) Other Debt, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromRepaymentsOfOtherDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Proceeds from (Repayments of) Other Debt </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_UncommittedCreditFacilitiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Uncommitted Credit Facilities [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_UncommittedCreditFacilitiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Uncommitted Credit Facilities [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_UncommittedCreditFacilitiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Uncommitted Credit Facilities [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Subsequent Event [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Fiscal 2023 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Expected Future Benefit Payment, Year One </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LicensingAgreementsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Licensing Costs [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LicensingAgreementsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Licensing Agreements [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherAssetImpairmentCharges_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Other impairment adjustments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherAssetImpairmentCharges_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Asset Impairment Charges </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MinorityInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Stockholders' Equity Attributable to Noncontrolling Interest, Ending Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MinorityInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel"> Stockholders' Equity Attributable to Noncontrolling Interest, Beginning Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MinorityInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Stockholders' Equity Attributable to Noncontrolling Interest, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MinorityInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Noncontrolling interests </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MinorityInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Stockholders' Equity Attributable to Noncontrolling Interest </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseInterestPaymentOnLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Operating cash flows related to finance leases </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseInterestPaymentOnLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Finance Lease, Interest Payment on Liability </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_IssuanceOfCommonStockValueNetOfStockReceivedForTaxWithholdings_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Issuance of common stock, net of stock received for tax withholdings </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_IssuanceOfCommonStockValueNetOfStockReceivedForTaxWithholdings_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Issuance Of Common Stock Value Net Of Stock Received For Tax Withholdings </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_IssuanceOfCommonStockValueNetOfStockReceivedForTaxWithholdings_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Issuance of common stock, value, net of stock received for tax withholdings. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Related Party </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Related Party [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Assets_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Identifiable assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Assets_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Total assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Assets_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RansomwarePreliminaryRecoveries_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Ransomware preliminary recoveries </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RansomwarePreliminaryRecoveries_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Ransomware Preliminary Recoveries </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RansomwarePreliminaryRecoveries_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Ransomware preliminary recoveries. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SpecialPurposeEntitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Special Purpose Entities [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SpecialPurposeEntitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Special Purpose Entities [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TransactionExpectedToCloseInLateSubjectToSatisfactionOfCustomary_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Transaction expected to close in late subject to satisfaction of customary </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TransactionExpectedToCloseInLateSubjectToSatisfactionOfCustomary_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Transaction Expected to Close in Late Subject to Satisfaction of Customary </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TransactionExpectedToCloseInLateSubjectToSatisfactionOfCustomary_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Transaction expected to close in late subject to satisfaction of customary. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeContractTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Derivative Contract </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeContractTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Derivative Contract [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NumberOfHighGraphicPlants_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Number of high graphic plants </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NumberOfHighGraphicPlants_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Number of High Graphic Plants </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NumberOfHighGraphicPlants_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Number of high graphic plants. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StateAndLocalJurisdictionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> State and Local Jurisdiction [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StateAndLocalJurisdictionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Jurisdictional Statutory Rates [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StateAndLocalJurisdictionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> State and Local Jurisdiction [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeTermOfContract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Derivative hedging volume period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeTermOfContract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Derivative, Term of Contract </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_FourPointZeroZeroPercentageSeniorNotesDueMarchTwoThousandTwentyThreeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> 4.00% Senior Notes Due March 2023 [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_FourPointZeroZeroPercentageSeniorNotesDueMarchTwoThousandTwentyThreeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Four Point Zero Zero Percentage Senior Notes Due March Two Thousand Twenty Three [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_FourPointZeroZeroPercentageSeniorNotesDueMarchTwoThousandTwentyThreeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Four point zero zero percentage senior notes due march two thousand twenty three. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Total accumulated other comprehensive (income) loss </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermDebtNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Long-Term Debt, Excluding Current Maturities, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermDebtNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Long-term debt due after one year </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermDebtNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Long-Term Debt, Excluding Current Maturities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanCurtailments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Curtailments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanCurtailments_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Earnings Per Share, Diluted, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Diluted earnings (loss) per share attributable to common stockholders </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Earnings Per Share, Diluted </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetirementPlanTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Pension Plan [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetirementPlanTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Retirement Plan Type [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TwoThousandTwentyIncentiveStockPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> 2020 Incentive Stock Plan [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TwoThousandTwentyIncentiveStockPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Two Thousand Twenty Incentive Stock Plan [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TwoThousandTwentyIncentiveStockPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Two thousand twenty incentive stock plan. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PledgedStatusAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Pledged Status [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressPostalZipCode_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Entity Address, Postal Zip Code </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressPostalZipCode_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Entity Address, Postal Zip Code </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InventoryFinishedGoodsAndWorkInProcess_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Inventory, Finished Goods and Work in Process, Gross, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InventoryFinishedGoodsAndWorkInProcess_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Finished goods and work in process </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InventoryFinishedGoodsAndWorkInProcess_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Inventory, Finished Goods and Work in Process, Gross </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Less: Other comprehensive income (loss) attributable to noncontrolling interests, Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Other Comprehensive Income (Loss), Tax, Portion Attributable to Noncontrolling Interest, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Comprehensive Income (Loss), Tax, Portion Attributable to Noncontrolling Interest </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentFiscalPeriodFocus_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Document Fiscal Period Focus </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentFiscalPeriodFocus_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Document Fiscal Period Focus </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CostOfGoodsAndServicesSold_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Cost of Goods and Services Sold, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CostOfGoodsAndServicesSold_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Cost of goods sold </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CostOfGoodsAndServicesSold_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Cost of Goods and Services Sold </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Deferred loss on cash flow hedges, Pre-Tax Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeLiabilityFairValueGrossAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Derivative asset offset with liability positions by counterparty </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeLiabilityFairValueGrossAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Derivative Liability, Subject to Master Netting Arrangement, Asset Offset </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OrganizationConsolidationBasisOfPresentationBusinessDescriptionAndAccountingPoliciesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Description of Business and Summary of Significant Accounting Policies </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OrganizationConsolidationBasisOfPresentationBusinessDescriptionAndAccountingPoliciesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CurrentIncomeTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Total current expense </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CurrentIncomeTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Current Income Tax Expense (Benefit) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TaxClaimAndConversionTaxPenaltiesRelatingToTaxYears_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Tax claim and conversion, tax penalties relating to tax years description </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TaxClaimAndConversionTaxPenaltiesRelatingToTaxYears_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Tax Claim And Conversion Tax Penalties Relating To Tax Years </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TaxClaimAndConversionTaxPenaltiesRelatingToTaxYears_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Tax claim and conversion tax penalties relating to tax years. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInAccountsReceivable_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Accounts receivable </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInAccountsReceivable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Increase (Decrease) in Accounts Receivable </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PensionPlansDefinedBenefitMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Pension Plan [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PensionPlansDefinedBenefitMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Pension Plan [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_StockIssuedDuringPeriodIssuanceOfClassCommonStockNetOfStockReceivedForTaxWithholdings_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Issuance of common stock, net of stock received for tax withholdings </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_StockIssuedDuringPeriodIssuanceOfClassCommonStockNetOfStockReceivedForTaxWithholdings_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Stock Issued During Period Issuance Of Class Common Stock Net Of Stock Received For Tax Withholdings </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_StockIssuedDuringPeriodIssuanceOfClassCommonStockNetOfStockReceivedForTaxWithholdings_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Stock issued during period, Issuance of class a common stock net of stock received for tax withholdings. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevolvingCreditFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Revolving Credit Facility [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevolvingCreditFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Revolving Credit Facility [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CatastrophicEventDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Catastrophic Event </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CatastrophicEventDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Catastrophic Event [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsValuationAllowance_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Valuation allowances </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsValuationAllowance_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax Assets, Valuation Allowance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Preferred stock, $0.01 par value; 30.0 million shares authorized; no shares outstanding </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Preferred Stock, Value, Issued </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DirectCostRecoveriesAsReductionOfSellingGeneralAndAdministrativeExpensesExcludingIntangibleAmortization_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Direct cost recoveries as reduction of Selling , general and administrative expenses excluding intangible amortization </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DirectCostRecoveriesAsReductionOfSellingGeneralAndAdministrativeExpensesExcludingIntangibleAmortization_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Direct cost recoveries as reduction of Selling , general and administrative expenses excluding intangible amortization. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LocationOfDeferredTaxesInBalanceSheetTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Location Of Deferred Taxes In Balance Sheet </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LocationOfDeferredTaxesInBalanceSheetTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Location Of Deferred Taxes In Balance Sheet Table [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LocationOfDeferredTaxesInBalanceSheetTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Location of deferred taxes in balance sheet. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> APIC, Share-Based Payment Arrangement, Increase for Cost Recognition, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Compensation expense under share-based plans </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> APIC, Share-Based Payment Arrangement, Increase for Cost Recognition </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Goodwill disposed of </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Goodwill, Written off Related to Sale of Business Unit </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Finance Leases, Fiscal 2027 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Finance Lease, Liability, to be Paid, Year Five </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsForProceedsFromOtherInvestingActivities_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Other </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsForProceedsFromOtherInvestingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Payments for (Proceeds from) Other Investing Activities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxLiabilitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Deferred income tax liabilities: </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxLiabilitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax Liabilities, Gross [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RightOfUseAssetsObtainedInExchangeForLeaseLiabilityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> ROU assets obtained in exchange for lease liabilities: </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RightOfUseAssetsObtainedInExchangeForLeaseLiabilityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Right Of Use Assets Obtained In Exchange For Lease Liability [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RightOfUseAssetsObtainedInExchangeForLeaseLiabilityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Right of use assets obtained in exchange for lease liability. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_CorrugatedMediumManufacturingOperationsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Corrugated Medium Manufacturing Operations [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_CorrugatedMediumManufacturingOperationsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Corrugated medium manufacturing operations. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DeferredTaxAssetLeaseLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Lease liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DeferredTaxAssetLeaseLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax Asset Lease Liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DeferredTaxAssetLeaseLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Deferred tax asset lease liabilities. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DeferredTaxAssetStateNetOperatingLossCarryforwardsNetOfFederalBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> State net operating loss carryforwards, net of federal benefit </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DeferredTaxAssetStateNetOperatingLossCarryforwardsNetOfFederalBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax Asset State Net Operating Loss Carryforwards Net Of Federal Benefit </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DeferredTaxAssetStateNetOperatingLossCarryforwardsNetOfFederalBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Deferred tax asset state net operating loss carryforwards, net of federal benefit. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_CanadianPrimeRateLoansMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Canadian Prime Rate Loans [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_CanadianPrimeRateLoansMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Canadian Prime Rate Loans [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_CanadianPrimeRateLoansMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Canadian prime rate loans [Member]. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Operating lease liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Total operating lease liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Operating Leases, Present value of future lease payments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating Lease, Liability </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Net cash used for financing activities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Net Cash Provided by (Used in) Financing Activities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ReductionOfSellingGeneralAndAdministrativeExpensesExcludingIntangibleAmortization_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Reduction of selling, general, and administrative expenses excluding intangible amortization. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ReductionOfSellingGeneralAndAdministrativeExpensesExcludingIntangibleAmortization_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Reduction of SG&A expenses excluding intangible amortization. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ReductionOfSellingGeneralAndAdministrativeExpensesExcludingIntangibleAmortization_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Reduction Of Selling General And Administrative Expenses Excluding Intangible Amortization </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanBenefitObligationContributionsByPlanParticipant_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Plan participant contributions </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanBenefitObligationContributionsByPlanParticipant_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Property, plant and equipment </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax Liabilities, Property, Plant and Equipment </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PensionAndOtherPostretirementPlansPolicy_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Pension and Other Postretirement Benefits </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PensionAndOtherPostretirementPlansPolicy_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Pension and Other Postretirement Plans, Policy [Policy Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestructuringAndOtherCostsOther_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Other total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestructuringAndOtherCostsOther_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Other </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestructuringAndOtherCostsOther_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restructuring And Other Costs Other </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestructuringAndOtherCostsOther_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Restructuring and other costs, other. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShortTermDebtTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Short-term Debt, Type </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShortTermDebtTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Short-Term Debt, Type [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestIncomeExpenseNetAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Interest Income (Expense), Net [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementOfFinancialPositionAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Statement of Financial Position [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DefinedBenefitPlanNetPeriodicBenefitCostCompany_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Company defined benefit plan income </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DefinedBenefitPlanNetPeriodicBenefitCostCompany_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan Net Periodic Benefit Cost Company </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DefinedBenefitPlanNetPeriodicBenefitCostCompany_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Defined benefit plan, net periodic benefit cost, company. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ForeignGovernmentDebtSecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Non-US government securities [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ForeignGovernmentDebtSecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt Security, Government, Non-US [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisposalGroupClassificationAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Disposal Group Classification </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisposalGroupClassificationAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Disposal Group Classification [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityFileNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Entity File Number </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityFileNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Entity File Number </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_EstimatedEnterpriseValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Estimated implied enterprise value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_EstimatedEnterpriseValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Estimated Enterprise Value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_EstimatedEnterpriseValue_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Estimated enterprise value. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ScenarioUnspecifiedDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Scenario </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ScenarioUnspecifiedDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Scenario [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityPaymentsDue_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Finance Leases, Total lease payments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityPaymentsDue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Finance Lease, Liability, to be Paid </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_UnsecuredMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Unsecured [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_UnsecuredMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Unsecured [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_UnsecuredMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Unsecured. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_BrazilAdministrativeCouncilOfTaxAppealsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Brazil Administrative Council of Tax Appeals [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_BrazilAdministrativeCouncilOfTaxAppealsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Brazil Administrative Council Of Tax Appeals [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_BrazilAdministrativeCouncilOfTaxAppealsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Brazil Administrative Council of Tax Appeals. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TransactionExpectedToCloseInFirstHalfSubjectToSatisfactionOfCustomary_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Transaction expected to close in first half subject to satisfaction of customary </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TransactionExpectedToCloseInFirstHalfSubjectToSatisfactionOfCustomary_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Transaction Expected To Close In First Half Subject To Satisfaction Of Customary </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TransactionExpectedToCloseInFirstHalfSubjectToSatisfactionOfCustomary_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Transaction expected to close in first half subject to satisfaction of customary. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NotesDueJuneTwoThousandAndTwentyMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Notes due June 2020 [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NotesDueJuneTwoThousandAndTwentyMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Notes Due June Two Thousand And Twenty [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NotesDueJuneTwoThousandAndTwentyMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Notes due June 2020. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Operating Leases, Thereafter </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Lessee, Operating Lease, Liability, to be Paid, after Year Five </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_BorrowingsOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Borrowings outstanding </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_BorrowingsOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Borrowings Outstanding </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_BorrowingsOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Borrowings outstanding. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubleaseIncome_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Sublease income </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubleaseIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Sublease Income </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Defined Benefit Plans, before Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Foreign currency translation (loss) gain, Pre-Tax Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BuildingAndBuildingImprovementsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Building and Building Improvements [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BuildingAndBuildingImprovementsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Building and Building Improvements [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromIssuanceOfDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Additions to debt </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromIssuanceOfDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Proceeds from Issuance of Debt </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Retirement Plans </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Retirement Benefits [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ValuationAllowancesAndReservesTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> SEC Schedule, 12-09, Valuation Allowances and Reserves Type </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ValuationAllowancesAndReservesTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_SegmentGeographicalDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Geographical </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_SegmentGeographicalDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Geographical [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_BrazilIndirectTaxClaimMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Brazil Indirect Tax Claim [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_BrazilIndirectTaxClaimMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Brazil Indirect Tax Claim [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_BrazilIndirectTaxClaimMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Brazil indirect tax claim. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_RangeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Statistical Measurement </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_RangeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Statistical Measurement [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementOfStockholdersEquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Statement of Stockholders' Equity [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CorporateMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Corporate Segment [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CorporateMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Corporate Segment [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NewReportableCorrugatedPackagingSegmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> New Reportable Corrugated Packaging Segment [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NewReportableCorrugatedPackagingSegmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> New reportable corrugated packaging segment. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ForeignCorporateDebtSecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Non-US corporate bonds [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ForeignCorporateDebtSecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt Security, Corporate, Non-US [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OperatingAndFinanceLeaseLiabilityPaymentsDueAfterYearFive_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Thereafter </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OperatingAndFinanceLeaseLiabilityPaymentsDueAfterYearFive_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating And Finance Lease Liability Payments Due After Year Five </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OperatingAndFinanceLeaseLiabilityPaymentsDueAfterYearFive_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Amount of lessee's undiscounted obligation for lease payments for operating and finance lease, due after fifth fiscal year following latest fiscal year. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AuditorLocation_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Auditor Location </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherCurrentLiabilitiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Other Current Liabilities [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherCurrentLiabilitiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Current Liabilities [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfStockDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Class of Stock </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfStockDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Class of Stock [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DeferredTaxLiabilitiesPension_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Pension </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DeferredTaxLiabilitiesPension_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax Liabilities Pension </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DeferredTaxLiabilitiesPension_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Deferred tax liabilities pension. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_UnamortizedImplementationCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Unamortized implementation costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_UnamortizedImplementationCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Unamortized Implementation Costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_UnamortizedImplementationCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Unamortized implementation costs. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Increases </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Reduction in sales and charges to costs and expenses </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainOnSaleOfInvestments_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Gain on sale of investment </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainOnSaleOfInvestments_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Gain on Sale of Investments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DebtInstrumentTransactionClosingDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Debt instrument, transaction closing date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DebtInstrumentTransactionClosingDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt Instrument Transaction Closing Date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DebtInstrumentTransactionClosingDate_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Debt instrument transaction closing date. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LeaseCostTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule of Components of Lease Costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LeaseCostTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Lease, Cost [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostCreditSettlementGainLossStatementOfIncomeOrComprehensiveIncomeExtensibleList_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NontaxableIncreasedCashSurrenderValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Nontaxable increased cash surrender value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NontaxableIncreasedCashSurrenderValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Nontaxable Increased Cash Surrender Value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NontaxableIncreasedCashSurrenderValue_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Nontaxable increased cash surrender value. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueByBalanceSheetGroupingTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Summary of Accounts Receivable Sales Agreements </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueByBalanceSheetGroupingTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Fair Value, by Balance Sheet Grouping [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Subsequent Events [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueDisclosuresTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Fair Value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueDisclosuresTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Fair Value Disclosures [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Weighted Average Exercise Price, Expired </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Weighted Average Remaining Contractual Term (in years), Exercisable at September 30, 2022 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromStockOptionsExercised_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Proceeds from Stock Options Exercised </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromStockOptionsExercised_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Proceeds from Stock Options Exercised </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermDebtAndCapitalLeaseObligations_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Long-Term Debt and Lease Obligation, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermDebtAndCapitalLeaseObligations_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Long-term debt due after one year </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermDebtAndCapitalLeaseObligations_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Long-Term Debt and Lease Obligation </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ReceivableFromFinancialInstitutionCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel"> Receivable from financial institutions at beginning of fiscal year </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ReceivableFromFinancialInstitutionCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Receivable from financial institutions at September 30, </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ReceivableFromFinancialInstitutionCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Receivable From Financial Institution Current </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ReceivableFromFinancialInstitutionCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Receivable from financial institution, current. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentGrossAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Property, plant and equipment at cost: </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentGrossAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Property, Plant and Equipment, Gross [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongtermDebtTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Long-term Debt, Type </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongtermDebtTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Long-Term Debt, Type [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_FinanceLeaseCostsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Finance lease cost: </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_FinanceLeaseCostsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Finance Lease Costs [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_FinanceLeaseCostsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Finance lease costs abstract. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InsuranceRecoveries_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Insurance recoveries </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InsuranceRecoveries_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Insurance Recoveries </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Fiscal Years 2028 - 2032 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RatioOfIndebtednessToNetCapital1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Credit facility, maximum permitted debt to capitalization ratio </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RatioOfIndebtednessToNetCapital1_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Ratio of Indebtedness to Net Capital </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredIncomeTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Total deferred (benefit) expense </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredIncomeTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Deferred income tax (benefit) expense </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredIncomeTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Income Tax Expense (Benefit) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromInsuranceSettlementOperatingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Insurance proceeds received, net cash provided by operating activities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromInsuranceSettlementOperatingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Proceeds from Insurance Settlement, Operating Activities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountingStandardsUpdate201802Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> ASU 2018-02 [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountingStandardsUpdate201802Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Accounting Standards Update 2018-02 [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Weighted Average Number of Shares Outstanding, Diluted, Adjustment, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Effect of dilutive stock options and non-participating securities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Weighted Average Number of Shares Outstanding, Diluted, Adjustment </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredIncomeTaxLiabilitiesNet_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Long-term deferred tax liability </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredIncomeTaxLiabilitiesNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Deferred income taxes </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredIncomeTaxLiabilitiesNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Income Tax Liabilities, Net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule of Property, Plant and Equipment </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Property, Plant and Equipment [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetRetirementObligationsNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Asset Retirement Obligations, Noncurrent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetRetirementObligationsNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Asset Retirement Obligations, Noncurrent, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ValuationAllowancesAndReservesDeductions_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel"> Reductions </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ValuationAllowancesAndReservesDeductions_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Deductions </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ValuationAllowancesAndReservesDeductions_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Other </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Proceeds from (Payments for) Other Financing Activities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SupplementaryInformationBalanceSheetsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Supplementary Information Balance Sheets [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SupplementaryInformationBalanceSheetsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Supplementary information balance sheets. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueFromContractWithCustomerTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Revenue Recognition </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueFromContractWithCustomerTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Revenue from Contract with Customer [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule Of Revenues From External Customers And Long Lived Assets [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Revenues from External Customers and Long-Lived Assets [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SecuredFinancingLiabilityMaturityinOctober2027Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Secured Financing Liability, Maturity in October 2027 [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SecuredFinancingLiabilityMaturityinOctober2027Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Secured Financing Liability Maturityin October2027 [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SecuredFinancingLiabilityMaturityinOctober2027Member_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Secured Financing Liability, Maturity in October 2027 [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel"> Amortization and settlement recognition of net actuarial loss, Pre-Tax Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Amortization of net actuarial loss, Pre-Tax Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Amortization and settlement recognition of net actuarial (loss) gain </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeFairValueOfDerivativeNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Derivative fair value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeFairValueOfDerivativeNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Derivative, Fair Value, Net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeFairValueOfDerivativeNet_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Derivative, Fair Value, Net, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DerivativeNotionalAmounts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Derivative, Notional Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DerivativeNotionalAmounts_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Derivative Notional Amounts </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DerivativeNotionalAmounts_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Derivative notional amounts. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_UnaffiliatedCustomersMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Unaffiliated Customers [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_UnaffiliatedCustomersMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Unaffiliated Customers [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_UnaffiliatedCustomersMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Unaffiliated customers. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_USGovernmentDebtSecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> US Government Debt Securities [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_USGovernmentDebtSecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> US Government Debt Securities [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Credit Facility, maximum borrowing capacity </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Line of Credit Facility, Maximum Borrowing Capacity </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_StockRepurchaseProgramAdditionalAuthorizedAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Stock repurchase program additional authorized amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_StockRepurchaseProgramAdditionalAuthorizedAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Stock Repurchase Program Additional Authorized Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_StockRepurchaseProgramAdditionalAuthorizedAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Stock repurchase program additional authorized amount. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockParOrStatedValuePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Preferred Stock, Par or Stated Value Per Share </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockParOrStatedValuePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Preferred Stock, Par or Stated Value Per Share </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RabobankCreditFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Rabobank Credit Facility [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RabobankCreditFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Rabobank Credit Facility [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RabobankCreditFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Rabobank credit facility [Member]. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerLiabilityCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel"> Short-Term Contract Liabilities, Beginning balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerLiabilityCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Short-Term Contract Liabilities, Ending balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerLiabilityCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Contract with Customer, Liability, Current </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel"> Reclassification adjustment of net loss on cash flow hedges included in earnings, Pre-Tax Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_InventoriesSuppliesAndSpareParts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Supplies and spare parts </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_InventoriesSuppliesAndSpareParts_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Inventories Supplies And Spare Parts </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_InventoriesSuppliesAndSpareParts_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Inventories supplies and spare parts. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Reclassification adjustment of net (gain) loss on cash flow hedges included in earnings, Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Foreign currency rate changes </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PercentageOfEmployeesCoveredByCollectiveBargainingAgreementsExpiringInOneYear_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Percentage of Employees Covered By Collective Bargaining Agreements Expiring in One Year </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PercentageOfEmployeesCoveredByCollectiveBargainingAgreementsExpiringInOneYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Percentage Of Employees Covered By Collective Bargaining Agreements Expiring In One Year </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PercentageOfEmployeesCoveredByCollectiveBargainingAgreementsExpiringInOneYear_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Percentage of employees covered by collective bargaining agreements expiring in one year. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_WeightedAverageDiscountRateAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Weighted average discount rate: </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_WeightedAverageDiscountRateAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Weighted Average Discount Rate [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_WeightedAverageDiscountRateAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Weighted average discount rate. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_InventoriesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Inventories [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_InventoriesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Inventories. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CreditFacilityDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Credit Facility [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Subsequent Events </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Subsequent Events [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Diluted weighted average shares outstanding </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Weighted Average Number of Shares Outstanding, Diluted </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetirementPlanSponsorLocationDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Retirement Plan Sponsor Location </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetirementPlanSponsorLocationDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Retirement Plan Sponsor Location [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_AssetSecuritizationFacilityCommitmentFeePercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Asset Securitization Facility Commitment Fee Percentage </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_AssetSecuritizationFacilityCommitmentFeePercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Asset Securitization Facility Commitment Fee Percentage </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_AssetSecuritizationFacilityCommitmentFeePercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Asset Securitization Facility Commitment Fee Percentage </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ReceivablesSecuritizationFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Receivables Securitization Facility [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ReceivablesSecuritizationFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Receivables Securitization Facility [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ReceivablesSecuritizationFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Receivables securitization facility. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Finite-Lived Intangible Assets, Major Class Name </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Finite-Lived Intangible Assets, Major Class Name [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CreditFacilityAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Credit Facility [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Defined Benefit Plan, Fair Value of Plan Assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel"> Fair value of plan assets at beginning of fiscal year </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Fair value of plan assets at end of fiscal year </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Plan Assets, Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SeniorNotesDueTwoThousandAndTwentyNineMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Senior Notes due 2029 [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SeniorNotesDueTwoThousandAndTwentyNineMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Senior Notes Due Two Thousand And Twenty Nine [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SeniorNotesDueTwoThousandAndTwentyNineMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Senior notes due two thousand and twenty nine. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DeferredTaxLiabilitiesInventoryReserves_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Inventory reserves </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DeferredTaxLiabilitiesInventoryReserves_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax Liabilities Inventory Reserves </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DeferredTaxLiabilitiesInventoryReserves_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Deferred tax liabilities, inventory reserves. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ValuationAllowancesAndReservesBalance_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel"> Balance at beginning of fiscal year </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ValuationAllowancesAndReservesBalance_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Balance at end of fiscal year </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ValuationAllowancesAndReservesBalance_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EnergyRelatedDerivativeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Natural Gas [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EnergyRelatedDerivativeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Energy Related Derivative [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Goodwill impairment </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Percent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainLossOnDispositionOfAssets1_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> (Gain) loss on disposal of assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainLossOnDispositionOfAssets1_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Gain (Loss) on Disposition of Assets, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainLossOnDispositionOfAssets1_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Gain (Loss) on Disposition of Assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DebtInstrumentTerminYears_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Debt instrument, term, in years </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DebtInstrumentTerminYears_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt Instrument Termin Years </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DebtInstrumentTerminYears_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Debt Instrument, Term, in Years </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_AsbestosLitigationMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Asbestos Litigation [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_AsbestosLitigationMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Asbestos Litigation [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_AsbestosLitigationMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Asbestos litigation. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommercialPaperMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Commercial Paper </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommercialPaperMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Commercial Paper [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LongTermPurchaseCommitmentEstimatedAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Long-term Purchase Commitment, Estimated Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LongTermPurchaseCommitmentEstimatedAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Long Term Purchase Commitment Estimated Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LongTermPurchaseCommitmentEstimatedAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Long-term purchase commitment, estimated amount. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CurrentFiscalYearEndDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Current Fiscal Year End Date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CurrentFiscalYearEndDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Current Fiscal Year End Date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InvestmentTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Investment Type </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InvestmentTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Investment Type [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ShortTermUnsecuredDebtMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Unsecured Debt [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ShortTermUnsecuredDebtMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Short Term Unsecured Debt [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ShortTermUnsecuredDebtMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Short term unsecured debt. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Depreciation_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Depreciation, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Depreciation_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Depreciation </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Depreciation_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Depreciation </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Financial Instruments [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RedemptionAmountOfLongTermDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Redemption amount of long term debt </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RedemptionAmountOfLongTermDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Redemption Amount Of Long Term Debt </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RedemptionAmountOfLongTermDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Redemption amount of long term debt. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Curtailment loss </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel"> Cash, cash equivalents and restricted cash at beginning of period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Cash, cash equivalents and restricted cash at end of period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Foreign rate differential </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermDebtByMaturityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Long-Term Debt, Fiscal Year Maturity [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherAssetsNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Other assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherAssetsNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Assets, Noncurrent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAccumulatedAndProjectedBenefitObligationsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule of Accumulated and Projected Benefit Obligations </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAccumulatedAndProjectedBenefitObligationsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Accumulated and Projected Benefit Obligations [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EMEAMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> EMEA </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EMEAMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> EMEA [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Total equity </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel"> Beginning balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Ending balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressAddressLine1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Entity Address, Address Line One </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressAddressLine1_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Entity Address, Address Line One </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ProceedsFromSaleOfSawmill_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Proceeds from sale of sawmill </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ProceedsFromSaleOfSawmill_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Proceeds From Sale Of Sawmill </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ProceedsFromSaleOfSawmill_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Proceeds from sale of sawmill. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Defined Benefit Plan, Plan Assets, Category </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Plan Assets, Category [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtWeightedAverageInterestRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Debt, Weighted Average Interest Rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtWeightedAverageInterestRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt, Weighted Average Interest Rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NoncontrollingInterestMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Noncontrolling Interests [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NoncontrollingInterestMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Noncontrolling Interest [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentAnnualReport_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Document Annual Report </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentAnnualReport_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Document Annual Report </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_InteriorPartitionsConvertingOperationsAndChattanoogaMillSubjectToWorkingCapitalAdjustment_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Sale of interior partitions converting operations and Chattanooga mill subject to working capital adjustment </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_InteriorPartitionsConvertingOperationsAndChattanoogaMillSubjectToWorkingCapitalAdjustment_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Interior Partitions Converting Operations And Chattanooga Mill Subject To Working Capital Adjustment </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_InteriorPartitionsConvertingOperationsAndChattanoogaMillSubjectToWorkingCapitalAdjustment_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Interior partitions converting operations and chattanooga mill subject to working capital adjustment. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ScheduleofAccumulatedOtherComprehensiveIncomeLossAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Scheduleof Accumulated Other Comprehensive Income Loss [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ScheduleofAccumulatedOtherComprehensiveIncomeLossAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Schedule of Accumulated Other Comprehensive Income (Loss) [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PrepaymentOfOutstandingPrincipalAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Prepayment of outstanding principal amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PrepaymentOfOutstandingPrincipalAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Prepayment Of Outstanding Principal Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PrepaymentOfOutstandingPrincipalAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Prepayment of outstanding principal amount. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Finite-Lived Intangible Assets by Major Class </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Finite-Lived Intangible Assets by Major Class [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PeriodsOfPaymentsUsedToCalculateWithdrawalLiabilityInConnectionWithPIUMPFWithdrawal_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Periods of Payments Used to Calculate Withdrawal Liability in Connection with PIUMPF Withdrawal </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PeriodsOfPaymentsUsedToCalculateWithdrawalLiabilityInConnectionWithPIUMPFWithdrawal_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Periods Of Payments Used To Calculate Withdrawal Liability In Connection With P I U M P F Withdrawal </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PeriodsOfPaymentsUsedToCalculateWithdrawalLiabilityInConnectionWithPIUMPFWithdrawal_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Periods of payments used to calculate withdrawal liability in connection with PIUMPF withdrawal. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromLinesOfCredit_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Proceeds from Lines of Credit, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromLinesOfCredit_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Additions to revolving credit facilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromLinesOfCredit_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Proceeds from Lines of Credit </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NotesReceivableInterestRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Notes Receivable Interest Rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NotesReceivableInterestRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Notes Receivable Interest Rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NotesReceivableInterestRate_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Notes Receivable Interest Rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel"> Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel"> Reclassification adjustment of net loss on cash flow hedges included in earnings </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestructuringAndOtherCostsPropertyPlantAndEquipmentAndRelatedCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> PP&E and related costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestructuringAndOtherCostsPropertyPlantAndEquipmentAndRelatedCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restructuring and Other Costs, Property, Plant and Equipment and Related Costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestructuringAndOtherCostsPropertyPlantAndEquipmentAndRelatedCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Restructuring and other costs, property, plant and equipment and related costs. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockwithServiceConditionAssumedinPurchaseAccountingMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Restricted Stock with Service Condition Assumed in Purchase Accounting [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockwithServiceConditionAssumedinPurchaseAccountingMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restricted Stockwith Service Condition Assumedin Purchase Accounting [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockwithServiceConditionAssumedinPurchaseAccountingMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Restricted Stock with Service Condition Assumed in Purchase Accounting [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Income tax expense </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Total income tax expense </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Income Tax Expense (Benefit) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Defined benefit plan, accumulated benefit obligation </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Accumulated Benefit Obligation </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PriorRevolvingCreditFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Prior Revolving Credit Facility [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PriorRevolvingCreditFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Prior Revolving Credit Facility [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PriorRevolvingCreditFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Prior revolving credit facility. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Income Taxes </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Income Tax Disclosure [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BalanceSheetLocationDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Balance Sheet Location </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BalanceSheetLocationDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Balance Sheet Location [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ForeignExchangeContractMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Foreign Exchange Contract [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ForeignExchangeContractMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Foreign Currency Exchange Contract Derivatives [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ForeignExchangeContractMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Foreign Exchange Contract [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_EmployeeStockPurchasePlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Employee Stock Purchase Plan [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_EmployeeStockPurchasePlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Employee Stock Purchase Plan [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_EmployeeStockPurchasePlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Employee stock purchase plan. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Income Tax Disclosure [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PriorPlansAssumedInMergersAndAcquisitionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Prior Plans Assumed in Mergers and Acquisitions [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PriorPlansAssumedInMergersAndAcquisitionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Prior Plans Assumed In Mergers And Acquisitions [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PriorPlansAssumedInMergersAndAcquisitionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Prior plans assumed in mergers and acquisitions. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ReductionOfInterestExpenseNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Indirect tax claim - reduction of interest expense, net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ReductionOfInterestExpenseNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Reduction Of Interest Expense Net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ReductionOfInterestExpenseNet_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Reduction of interest expense, net. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisaggregationOfRevenueAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Disaggregation of Revenue [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ChangeInAccountingPrincipleAccountingStandardsUpdateAdoptionDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Change in Accounting Principle, Accounting Standards Update, Adoption Date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NewReportableDistributionSegmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> New Reportable Distribution Segment [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NewReportableDistributionSegmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> New reportable distribution segment. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_CorrugatedPackagingMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Corrugated Packaging [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_CorrugatedPackagingMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Corrugated Packaging [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_CorrugatedPackagingMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Corrugated packaging. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PercentageOfAwardBasedOnLevelOfPerformanceAttainedMaximum_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Percentage of Award Based on Level of Performance Attained, Maximum </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PercentageOfAwardBasedOnLevelOfPerformanceAttainedMaximum_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Percentage Of Award Based On Level Of Performance Attained Maximum </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PercentageOfAwardBasedOnLevelOfPerformanceAttainedMaximum_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Percentage of Award Based on Level of Performance Attained, Maximum </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ProceedsFromSaleOfCostMethodInvestment_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Proceeds from sale of investment </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ProceedsFromSaleOfCostMethodInvestment_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Proceeds From Sale Of Cost Method Investment </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ProceedsFromSaleOfCostMethodInvestment_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Proceeds from sale of cost method investment. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Other, net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Effective Income Tax Rate Reconciliation, Other Adjustments, Percent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockTargetAwards2017Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Restricted Stock, Target Awards, 2017 [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockTargetAwards2017Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restricted Stock Target Awards2017 [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockTargetAwards2017Member_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Restricted stock, target awards, 2017. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueByFairValueHierarchyLevelAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Fair Value Hierarchy and NAV </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueByFairValueHierarchyLevelAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Fair Value Hierarchy and NAV [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Share-based Compensation </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Payment Arrangement [Policy Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Amortization of prior service cost (credit) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Amortization of Prior Service Cost (Credit) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AuditorName_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Auditor Name </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsTaxEffect_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Adoption of ASU 2018-12 reclassification of stranded tax effects resulting from Tax Reform </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsTaxEffect_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Reclassification of stranded tax effects </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsTaxEffect_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MultiemployerPlansWithdrawalObligation_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Multiemployer Plans, Withdrawal Obligation </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MultiemployerPlansWithdrawalObligation_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Multiemployer Plans, Withdrawal Obligation </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Equity: </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Equity [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Finance Leases, Fiscal 2026 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Finance Lease, Liability, to be Paid, Year Four </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OperatingAndFinanceLeaseLiabilityPaymentsDue_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Total lease payments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OperatingAndFinanceLeaseLiabilityPaymentsDue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating And Finance Lease Liability Payments Due </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OperatingAndFinanceLeaseLiabilityPaymentsDue_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Amount of lessee's undiscounted obligation for lease payments for operating and finance lease. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ScheduleOfLeaseTermDiscountRateTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Summary of Lease Term and Discount Rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ScheduleOfLeaseTermDiscountRateTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule Of Lease Term Discount Rate Table [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ScheduleOfLeaseTermDiscountRateTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Schedule of lease term discount rate table. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_GondiSADeCVMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Grupo Gondi [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_GondiSADeCVMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Gondi, S.A. de C.V. [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_GondiSADeCVMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Gondi, S.A. de C.V. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_KapStoneMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> KapStone [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_KapStoneMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Kap Stone [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_KapStoneMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> KapStone. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBenefitPlanImprovementTaxEffect_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Prior service cost arising during the period, Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBenefitPlanImprovementTaxEffect_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingIncomeLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Operating profit (loss) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingIncomeLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating Income (Loss) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentInterestRateStatedPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Debt instrument, interest rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentInterestRateStatedPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt Instrument, Interest Rate, Stated Percentage </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Related Party </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Related Party [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationIntegrationRelatedCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Integration costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationIntegrationRelatedCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Business Combination, Integration Related Costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_FinanceLeaseAccumulatedDepreciationPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Accumulated depreciation </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_FinanceLeaseAccumulatedDepreciationPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Finance Lease Accumulated Depreciation Property Plant And Equipment </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_FinanceLeaseAccumulatedDepreciationPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Finance lease accumulated depreciation property, plant and equipment. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdditionalPaidInCapitalCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Capital in excess of par value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdditionalPaidInCapitalCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Additional Paid in Capital, Common Stock </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Finance Leases, Thereafter </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Finance Lease, Liability, to be Paid, after Year Five </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_InterestRateTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Interest Rate Type </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_InterestRateTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Interest Rate Type [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_InterestRateTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Interest Rate Type [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Payments to Acquire Businesses, Net of Cash Acquired, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Cash paid for purchase of businesses, net of cash acquired </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Payments to Acquire Businesses, Net of Cash Acquired </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_StatementScenarioAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Scenario </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_StatementScenarioAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Scenario [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_MultiemployerPensionWithdrawalIncomeExpense_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Multiemployer pension withdrawal expense (income) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_MultiemployerPensionWithdrawalIncomeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Multiemployer pension withdrawal (expense) income </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_MultiemployerPensionWithdrawalIncomeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Multiemployer Pension Withdrawal Income Expense </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_MultiemployerPensionWithdrawalIncomeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Multiemployer pension withdrawal income / expense. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ReversalOfDepreciationDepletionAndAmortization_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Depreciation, depletion and amortization </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ReversalOfDepreciationDepletionAndAmortization_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Reversal of Depreciation Depletion and Amortization </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ReversalOfDepreciationDepletionAndAmortization_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Reversal of depreciation depletion and amortization. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ConsolidatedStatementsOfEquityParentheticalInformationAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Consolidated Statements Of Equity Parenthetical Information [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ConsolidatedStatementsOfEquityParentheticalInformationAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Phantom Tags [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SupplementalCashFlowInformationRelatedToLeasesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Supplemental Cash Flow Information Related To Leases [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SupplementalCashFlowInformationRelatedToLeasesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Supplemental cash flow information related to leases abstract. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PercentageOfAwardedBasedOnPerformanceLevelAchieved_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Percentage of Awarded Based on Performance Level Achieved </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PercentageOfAwardedBasedOnPerformanceLevelAchieved_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Percentage Of Awarded Based On Performance Level Achieved </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PercentageOfAwardedBasedOnPerformanceLevelAchieved_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Percentage of awarded based on performance level achieved. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityFilerCategory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Entity Filer Category </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityFilerCategory_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Entity Filer Category </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfComprehensiveIncomeLossTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule of Other Comprehensive Income (Loss) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfComprehensiveIncomeLossTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Comprehensive Income (Loss) [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NotesDueFiscal2022Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Notes Due Fiscal 2022 [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NotesDueFiscal2022Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Notes Due Fiscal2022 [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NotesDueFiscal2022Member_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Notes due fiscal 2022. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockWithServiceConditionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Restricted Stock with Service Condition [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockWithServiceConditionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restricted Stock With Service Condition [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockWithServiceConditionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Restricted stock with service conditions. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanPlanAmendments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Amendments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanPlanAmendments_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ChangeInAccountingPrincipleAccountingStandardsUpdateEarlyAdoption_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Change in Accounting Principle, Accounting Standards Update, Early Adoption [true false] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Amortization of prior service cost, Pre-Tax Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Amortization of prior service (cost) credit </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Amortization of prior service credits (costs), Pre-Tax Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Net current period other comprehensive (loss) income </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Other comprehensive (loss) income, net of tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_AsiaPacificMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Asia Pacific [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_AsiaPacificMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Asia Pacific [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityCurrentReportingStatus_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Entity Current Reporting Status </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityCurrentReportingStatus_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Entity Current Reporting Status </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GoodwillForeignCurrencyTranslationGainLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Translation adjustments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GoodwillForeignCurrencyTranslationGainLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Goodwill, Foreign Currency Translation Gain (Loss) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DivestitureRelatedCostsCredits_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Divestiture costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DivestitureRelatedCostsCredits_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Divestiture Related Costs Credits </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DivestitureRelatedCostsCredits_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Divestiture related costs credits. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ReceivableForExpectedRecoveryAndInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Indirect tax claim - receivable for expected recovery and interest </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ReceivableForExpectedRecoveryAndInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Receivable For Expected Recovery And Interest </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ReceivableForExpectedRecoveryAndInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Receivable for expected recovery and interest. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InventoryNet_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Net inventories </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InventoryNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Inventories </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InventoryNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Inventory, Net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CurrentStateAndLocalTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> State </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CurrentStateAndLocalTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Current State and Local Tax Expense (Benefit) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestructuringAndRelatedCostCostIncurredToDate1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Restructuring and Related Cost, Cost Incurred to Date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestructuringAndRelatedCostCostIncurredToDate1_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restructuring and Related Cost, Cost Incurred to Date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_IcfrAuditorAttestationFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> ICFR Auditor Attestation Flag </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_IcfrAuditorAttestationFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> ICFR Auditor Attestation Flag </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Aggregate Intrinsic Value, Exercisable at September 30, 2022 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_MulticurrencyRevolvingFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Multicurrency Revolving Facility [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_MulticurrencyRevolvingFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Multicurrency Revolving Facility [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_MulticurrencyRevolvingFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Multicurrency revolving facility [Member]. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InventoryDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Inventories </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InventoryDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Inventory Disclosure [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Payment Arrangement, Noncash Expense [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_GlobalPaperSegmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Global Paper Segment [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_GlobalPaperSegmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Global Paper segment. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostCreditAmortizationOfPriorServiceCostCreditStatementOfIncomeOrComprehensiveIncomeExtensibleList_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Amortization of Prior Service Cost (Credit), Statement of Income or Comprehensive Income [Extensible Enumeration] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquityNoteDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Stockholders' Equity </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquityNoteDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Stockholders' Equity Note Disclosure [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Business Combinations [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Total Stockholders equity </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel"> Total Stockholders' equity </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Total Stockholders’ equity </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Stockholders' Equity Attributable to Parent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_IncomeLossExcludingPortionAttributableToRedeemableNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Net income (loss) attributable to common stockholders </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_IncomeLossExcludingPortionAttributableToRedeemableNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Income Loss Excluding Portion Attributable To Redeemable Noncontrolling Interest </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_IncomeLossExcludingPortionAttributableToRedeemableNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Income (loss), excluding portion attributable to redeemable noncontrolling interest. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_MeadWestvacoMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> MeadWestvaco [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_MeadWestvacoMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Mead Westvaco [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_MeadWestvacoMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> MeadWestvaco. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Accumulated Other Comprehensive Loss [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> AOCI Attributable to Parent [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShortTermInvestmentsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Short-term Investments [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShortTermInvestmentsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Short-Term Investments [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_InstallmentNoteMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Installment Note [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_InstallmentNoteMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Installment Note [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_InstallmentNoteMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Installment Note [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BaseRateMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Base Rate [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BaseRateMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Base Rate [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfExpectedBenefitPaymentsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule of Estimated Benefit Payments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfExpectedBenefitPaymentsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Expected Benefit Payments [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Effect of exchange rate changes on cash, cash equivalents and restricted cash </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Fiscal 2024 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Long-Term Debt, Maturity, Year Two </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentsIncorporatedByReferenceTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Documents Incorporated by Reference </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentsIncorporatedByReferenceTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Documents Incorporated by Reference [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_AdditionalAccrualsAndAdjustmentsToAccruals_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Additional accruals and adjustments to accruals (see table above) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_AdditionalAccrualsAndAdjustmentsToAccruals_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Additional Accruals And Adjustments To Accruals </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_AdditionalAccrualsAndAdjustmentsToAccruals_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Additional accruals and adjustments to accruals. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityTaxIdentificationNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Entity Tax Identification Number </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityTaxIdentificationNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Entity Tax Identification Number </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetRetirementObligationCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Asset Retirement Obligation, Current </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeStatementLocationAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Income Statement Location </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeStatementLocationAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Income Statement Location [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Shares/Units, Forfeited </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Common stock, $0.01 par value; 600.0 million shares authorized; 254.4 million and 265.0 million shares outstanding at September 30, 2022 and September 30, 2021, respectively </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Common Stock, Value, Issued </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ConsolidationItemsAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Consolidation Items </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ConsolidationItemsAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Consolidation Items [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Retained Earnings (Accumulated Deficit), Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Retained earnings </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Retained Earnings (Accumulated Deficit) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_CumulativeEffectPeriodOfAdoptionDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Cumulative Effect, Period of Adoption </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_CumulativeEffectPeriodOfAdoptionDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Cumulative Effect, Period of Adoption [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementEquityComponentsAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Equity Components </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementEquityComponentsAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Equity Components [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NewAccountingPronouncementsRecentlyIssuedPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> New Accounting Standards - Recently Issued </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NewAccountingPronouncementsRecentlyIssuedPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> New Accounting Pronouncements Recently Issued Policy Policy [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NewAccountingPronouncementsRecentlyIssuedPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> New accounting pronouncements recently issued policy. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmountByMoreThan_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Reporting unit, percentage of fair value in excess of carrying value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmountByMoreThan_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Reporting Unit Percentage of Fair Value In Excess of Carrying Amount By More Than </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmountByMoreThan_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Reporting unit percentage of fair value in excess of carrying amount by more than. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NonUSDollarCurrenciesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Non-U.S. Dollar Currencies [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NonUSDollarCurrenciesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Non U S Dollar Currencies [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NonUSDollarCurrenciesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Non-U.S dollar currencies. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ReceivablesBackedFinancingMaximumBorrowingAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Receivables backed financing, maximum borrowing amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ReceivablesBackedFinancingMaximumBorrowingAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Receivables Backed Financing Maximum Borrowing Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ReceivablesBackedFinancingMaximumBorrowingAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Receivables backed financing maximum borrowing amount. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LineOfCreditFacilityNumberOfDrawdowns_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Number of drawdowns under credit facility </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LineOfCreditFacilityNumberOfDrawdowns_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Line Of Credit Facility Number Of Drawdowns </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LineOfCreditFacilityNumberOfDrawdowns_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Line of credit facility number of drawdowns. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationAcquisitionRelatedCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Acquisition costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationAcquisitionRelatedCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Business Combination, Acquisition Related Costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TypeOfAdoptionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Accounting Standards Update </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TypeOfAdoptionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Accounting Standards Update [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_BadDebtExpenseCredit_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Bad debt expense (credit) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_BadDebtExpenseCredit_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Bad Debt Expense Credit </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_BadDebtExpenseCredit_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Bad debt expense (credit). </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SegmentReportingInformationPercentageOfSegmentIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Percentage of Segment Income </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SegmentReportingInformationPercentageOfSegmentIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Segment Reporting Information Percentage Of Segment Income </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SegmentReportingInformationPercentageOfSegmentIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Segment reporting information, percentage of segment income. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountsPayableOtherCurrentAndNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Accrued additions to property, plant and equipment (in accounts payable) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountsPayableOtherCurrentAndNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Accounts Payable, Other </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Cash Equivalents </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Cash and Cash Equivalents, Policy [Policy Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DeferredTaxLiabilitiesTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Accruals and allowances </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DeferredTaxLiabilitiesTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax liabilities Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DeferredTaxLiabilitiesTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Deferred tax liabilities tax deferred expense reserves and accruals allowance for doubtful accounts </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LeasesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Leases [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_WorkersCompensationPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Workers Compensation </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_WorkersCompensationPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Workers Compensation Policy Policy [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_WorkersCompensationPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Workers Compensation, Policy [Policy Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CustomerRelationshipsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Customer Relationships [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CustomerRelationshipsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Customer Relationships [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisaggregationOfRevenueTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Disaggregation Of Revenue [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisaggregationOfRevenueTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Disaggregation of Revenue [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PublicBondObligationsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Public Bond Obligations [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PublicBondObligationsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Public Bond Obligations [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PublicBondObligationsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Public Bond Obligations [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Fiscal 2025 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Expected Future Benefit Payment, Year Three </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityEmergingGrowthCompany_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Entity Emerging Growth Company </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityEmergingGrowthCompany_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Entity Emerging Growth Company </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NonRecourseLiabilitiesHeldBySpecialPurposeEntities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Non-recourse liabilities held by special purpose entities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NonRecourseLiabilitiesHeldBySpecialPurposeEntities_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Non Recourse Liabilities Held By Special Purpose Entities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NonRecourseLiabilitiesHeldBySpecialPurposeEntities_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Non-recourse liabilities held by special purpose entities. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NumberOfPaperMills_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Number of paper mills </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NumberOfPaperMills_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Number of Paper Mills </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NumberOfPaperMills_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Number of paper mills. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MineralRights_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Mineral rights </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MineralRights_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Mineral Rights </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TaxCreditCarryforwardValuationAllowance_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Tax credit carryforward, valuation allowance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TaxCreditCarryforwardValuationAllowance_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Tax Credit Carryforward, Valuation Allowance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule Of Business Acquisitions By Acquisition [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Business Acquisitions, by Acquisition [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanInterestCost_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Interest cost </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanInterestCost_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Interest Cost </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GoodwillRollForward_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Goodwill [Roll Forward] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GoodwillRollForward_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Goodwill [Roll Forward] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentDescriptionOfVariableRateBasis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Variable rate basis </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentDescriptionOfVariableRateBasis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt Instrument, Description of Variable Rate Basis </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockServiceConditionandCashFlowperSharePerformanceConditionatTargetMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Restricted Stock Service Condition and Cash Flow per Share Performance Condition at Target [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockServiceConditionandCashFlowperSharePerformanceConditionatTargetMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restricted Stock Service Conditionand Cash Flowper Share Performance Conditionat Target [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockServiceConditionandCashFlowperSharePerformanceConditionatTargetMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Restricted Stock, Service Condition and Cash Flow per Share Performance Condition at Target [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel"> Amortization and settlement recognition of net actuarial loss, Net of Tax Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Prior service cost arising during period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Net actuarial (loss) gain arising during period, Pre-Tax Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel"> Net actuarial loss (gain) arising during period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Net actuarial gain arising during period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CurrentFederalTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Federal </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CurrentFederalTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Current Federal Tax Expense (Benefit) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GoodwillLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Goodwill [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GoodwillLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Goodwill [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetirementPlanTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Retirement Plan Type </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetirementPlanTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Retirement Plan Type [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_FinanceLeaseObligationsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Finance Lease Obligations [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_FinanceLeaseObligationsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Finance Lease Obligations [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_FinanceLeaseObligationsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Finance lease obligations. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="country_CA_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Canada [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="country_CA_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> CANADA </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueRecognitionPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Revenue Recognition </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueRecognitionPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Revenue [Policy Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Amortization of prior service cost, Net of Tax Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Amortization of prior service credits (costs), Net of Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Amortization and curtailment recognition of prior service cost, included in pension and postretirement cost </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicCostRateOfCompensationIncrease_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Defined Benefit Plan, Assumptions Used Calculating Net Periodic Cost, Rate of Compensation Increase </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicCostRateOfCompensationIncrease_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan Assumptions Used Calculating Net Periodic Cost Rate Of Compensation Increase </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicCostRateOfCompensationIncrease_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Defined benefit plan assumptions used calculating net periodic cost rate of compensation increase. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PlanAssetCategoriesDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Defined Benefit Plan, Plan Assets, Category </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PlanAssetCategoriesDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Plan Assets, Category [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LetterOfCreditMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Letter of Credit [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LetterOfCreditMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Letter of Credit [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Expected term (in years) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Expected term in years </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SecuredDebtMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Secured Debt [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SecuredDebtMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Secured Debt [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel"> Amortization and settlement recognition of net actuarial loss, Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Amortization of net actuarial loss, Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Amortization of net actuarial loss, Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_EuropeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Europe [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_EuropeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Europe [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Accruals and allowances </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax Asset, Tax Deferred Expense, Reserve and Accrual, Accounts Receivable, Allowance for Credit Loss </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanServiceCost_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Service cost </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanServiceCost_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Service Cost </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityVoluntaryFilers_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Entity Voluntary Filers </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityVoluntaryFilers_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Entity Voluntary Filers </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredFederalIncomeTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Federal </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredFederalIncomeTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Federal Income Tax Expense (Benefit) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OperatingAndFinanceLeaseLiabilityUndiscountedExcessAmount_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Less: Interest </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OperatingAndFinanceLeaseLiabilityUndiscountedExcessAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating And Finance Lease Liability Undiscounted Excess Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OperatingAndFinanceLeaseLiabilityUndiscountedExcessAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Amount of lessee's undiscounted obligation for lease payments and finance lease in excess of discounted obligation for lease payments for operating and finance lease. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CompensationAndRetirementDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Retirement Benefits [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentTransitionReport_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Document Transition Report </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentTransitionReport_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Document Transition Report </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLossCarryforwardsValuationAllowance_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Operating Loss Carryforwards, Valuation Allowance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLossCarryforwardsValuationAllowance_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating Loss Carryforwards, Valuation Allowance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainOnBusinessInterruptionInsuranceRecoveryStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Gain on Business Interruption Insurance Recovery, Statement of Income or Comprehensive Income [Extensible Enumeration] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_FourPointNineZeroZeroPercentageSeniorNotesDueMarchTwoThousandTwentyTwoMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> 4.900% Senior Notes Due March 2022 [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_FourPointNineZeroZeroPercentageSeniorNotesDueMarchTwoThousandTwentyTwoMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Four Point Nine Zero Zero Percentage Senior Notes Due March Two Thousand Twenty Two [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_FourPointNineZeroZeroPercentageSeniorNotesDueMarchTwoThousandTwentyTwoMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Four point nine zero zero percentage senior notes due March two thousand twenty two. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfIncomeBeforeIncomeTaxDomesticAndForeignTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule of Income (Loss) before Income Tax, Domestic and Foreign </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfIncomeBeforeIncomeTaxDomesticAndForeignTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Fiscal 2025 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Long-Term Debt, Maturity, Year Three </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Weighted Average Grant Date Fair Value, Granted </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Weighted average grant date fair value, granted </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_UsEquitySecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> US Equity Securities [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_UsEquitySecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Us Equity Securities [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_UsEquitySecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> US equity securities. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeLiabilityCurrentStatementOfFinancialPositionExtensibleEnumeration_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_EffectiveIncomeTaxRateReconciliationTaxCreditResearchAndDevelopmentAndOtherTaxCreditsPercent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Research and development and other tax credits, net of reserves </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_EffectiveIncomeTaxRateReconciliationTaxCreditResearchAndDevelopmentAndOtherTaxCreditsPercent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Effective Income Tax Rate Reconciliation Tax Credit Research And Development And Other Tax Credits Percent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_EffectiveIncomeTaxRateReconciliationTaxCreditResearchAndDevelopmentAndOtherTaxCreditsPercent_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Effective income tax rate reconciliation, tax credit, research and development and other tax credits, percent. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="stpr_TN_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Chattanooga, TN [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="stpr_TN_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> TENNESSEE </link:label>
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<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DepreciationDepletionAndAmortization_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Depreciation, Depletion and Amortization, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DepreciationDepletionAndAmortization_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Depreciation, depletion and amortization </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DepreciationDepletionAndAmortization_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Depreciation, Depletion and Amortization </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_IncomeTaxesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Income Taxes [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_IncomeTaxesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Income Taxes [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_IncomeTaxesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Income taxes. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SupplementalCashFlowInformationRelatedToLeasesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Summary of Supplemental Cash Flow Information Related to Leases </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SupplementalCashFlowInformationRelatedToLeasesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Supplemental Cash Flow Information Related To Leases Table [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SupplementalCashFlowInformationRelatedToLeasesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Supplemental cash flow information related to leases. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule Of Segment Reporting Information By Segment [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Segment Reporting Information, by Segment [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DefinedContributionPlanEmployerContributionOnBasicSalaryMaximumHighEndOfRange_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Defined Contribution Plan Employer Contribution on Basic Salary, Maximum, High End of Range </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DefinedContributionPlanEmployerContributionOnBasicSalaryMaximumHighEndOfRange_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Contribution Plan Employer Contribution On Basic Salary Maximum High End Of Range </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DefinedContributionPlanEmployerContributionOnBasicSalaryMaximumHighEndOfRange_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Defined contribution plan employer contribution on basic salary, maximum, high end of range. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockAttainmentofPerformanceConditioninExcessofTargetMemberMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Restricted Stock, Attainment of Performance Condition in Excess of Target </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockAttainmentofPerformanceConditioninExcessofTargetMemberMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restricted Stock Attainmentof Performance Conditionin Excessof Target Member [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockAttainmentofPerformanceConditioninExcessofTargetMemberMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Restricted Stock, Attainment of Performance Condition in Excess of Target [Member] [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Commitments and Contingencies </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Commitments and Contingencies Disclosure [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Weighted Average Exercise Price, Exercised </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Foreign </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Income (Loss) from Continuing Operations before Income Taxes, Foreign </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TaxProvisionAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Tax Provision [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TaxProvisionAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Tax Provision [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Accumulated Other Comprehensive Income (Loss), Net of Tax, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Accumulated other comprehensive loss </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel"> Balance at beginning of period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Balance at end of period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Accumulated Other Comprehensive Income (Loss), Net of Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PercentageOfAwardBasedOnLevelOfPerformanceAttainedMinimum_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Percentage of Award Based on Level of Performance Attained, Minimum </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PercentageOfAwardBasedOnLevelOfPerformanceAttainedMinimum_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Percentage Of Award Based On Level Of Performance Attained Minimum </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PercentageOfAwardBasedOnLevelOfPerformanceAttainedMinimum_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Percentage of Award Based on Level of Performance Attained, Minimum </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountsReceivableNetCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Accounts receivable (net of allowances of $66.3 and $68.1) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountsReceivableNetCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Accounts Receivable, after Allowance for Credit Loss, Current, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountsReceivableNetCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Accounts Receivable, after Allowance for Credit Loss, Current </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Excess tax benefit related to stock compensation </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-Based Payment Arrangement, Percent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityCommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Entity Common Stock, Shares Outstanding </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityCommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Entity Common Stock, Shares Outstanding </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> State </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred State and Local Income Tax Expense (Benefit) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Other comprehensive (loss) income, net of tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Comprehensive Income (Loss), Net of Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AmortizationOfFinancingCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Amortization of debt issuance costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AmortizationOfFinancingCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Amortization of Debt Issuance Costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfChangesInProjectedBenefitObligationsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule of Changes in Benefit Obligations </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfChangesInProjectedBenefitObligationsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Changes in Projected Benefit Obligations [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Net income (loss) attributable to common stockholders </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Net income (loss) attributable to common stockholders </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Net Income (Loss) Attributable to Parent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Defined benefit plan, plan with benefit obligation in excess of plan assets, benefit obligation </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiabilityCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Current operating lease liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiabilityCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating Lease, Liability, Current </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Security Owned and Sold, Not yet Purchased, at Fair Value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Security Owned and Sold, Not yet Purchased, at Fair Value [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecreaseAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Defined benefit pension and other postretirement benefit plans: </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecreaseAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashFlowsBetweenTransfereeAndTransferorProceedsFromCollectionsReinvestedInRevolvingPeriodTransfers_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Receivables collected by financial institutions </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashFlowsBetweenTransfereeAndTransferorProceedsFromCollectionsReinvestedInRevolvingPeriodTransfers_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Cash Flows Between Transferor and Transferee, Proceeds from Collections Reinvested in Revolving Period Transfers </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalOther_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Other </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalOther_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Adjustments to Additional Paid in Capital, Other </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DefinedBenefitPlansAssetsMeasuredatNAVFairValueOfPlanAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Defined Benefit Plans, Fair Value of Plan Assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DefinedBenefitPlansAssetsMeasuredatNAVFairValueOfPlanAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Assets measured at NAV </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DefinedBenefitPlansAssetsMeasuredatNAVFairValueOfPlanAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plans Assets Measuredat N A V Fair Value Of Plan Assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DefinedBenefitPlansAssetsMeasuredatNAVFairValueOfPlanAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Defined benefit plans, assets measured at NAV, fair value of plan assets. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdditionalPaidInCapitalMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Capital in Excess of Par Value [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdditionalPaidInCapitalMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Additional Paid-in Capital [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_IncreaseInDiscountRateToEstimateFairValueOfReportingUnit_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Increase in discount rate to estimate fair value of reporting unit. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_IncreaseInDiscountRateToEstimateFairValueOfReportingUnit_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Increase in discount rate to estimate fair value of reporting unit </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_IncreaseInDiscountRateToEstimateFairValueOfReportingUnit_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Increase in Discount Rate To Estimate Fair Value Of Reporting Unit </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Decrease in Unrecognized Tax Benefits is Reasonably Possible </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Decrease in Unrecognized Tax Benefits is Reasonably Possible </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LineOfCreditFacilityExpirationDate1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Credit facility, maturity date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LineOfCreditFacilityExpirationDate1_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Line of Credit Facility, Expiration Date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NumberOfLawsuitsTheCompanyHasBeenNamedADefendantInAsbestosRelatedPersonalInjuryLitigation_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Number of Lawsuits the Company Has Been Named a Defendant in Asbestos-related Personal Injury Litigation </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NumberOfLawsuitsTheCompanyHasBeenNamedADefendantInAsbestosRelatedPersonalInjuryLitigation_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Number Of Lawsuits The Company Has Been Named A Defendant In Asbestos Related Personal Injury Litigation </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NumberOfLawsuitsTheCompanyHasBeenNamedADefendantInAsbestosRelatedPersonalInjuryLitigation_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Number of lawsuits the company has been named a defendant in asbestos-related personal injury litigation. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule of Aggregate Maturities of Debt </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Maturities of Long-Term Debt [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationWeightedAverageInterestCreditingRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Interest crediting rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationWeightedAverageInterestCreditingRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Weighted-Average Interest Crediting Rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DefinedBenefitPlanInvestmentsValuePerUnit_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Short-term investments per units </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DefinedBenefitPlanInvestmentsValuePerUnit_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan Investments Value Per Unit </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DefinedBenefitPlanInvestmentsValuePerUnit_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Defined benefit plan investments value per unit. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityRegistrantName_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Entity Registrant Name </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityRegistrantName_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Entity Registrant Name </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TreasuryStockValueAcquiredParValueMethod_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Purchases of common stock </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TreasuryStockValueAcquiredParValueMethod_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Purchases of common stock </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TreasuryStockValueAcquiredParValueMethod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Aggregate cost for purchase of common stock </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TreasuryStockValueAcquiredParValueMethod_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Treasury Stock, Value, Acquired, Par Value Method </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_UnrecognizedTaxBenefitsIncreaseDecreaseResultingFromForeignCurrencyTranslation_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> (Reductions) additions for currency translation adjustments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_UnrecognizedTaxBenefitsIncreaseDecreaseResultingFromForeignCurrencyTranslation_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Unrecognized Tax Benefits Increase Decrease Resulting From Foreign Currency Translation </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_UnrecognizedTaxBenefitsIncreaseDecreaseResultingFromForeignCurrencyTranslation_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Unrecognized tax benefits, increase (decrease) resulting from foreign currency translation. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Reductions as a result of a lapse of the applicable statute of limitations </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_AccountsReceivableRangeReceivablesDueDays_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Accounts Receivable, Approximate Range Receivables Due, Days </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_AccountsReceivableRangeReceivablesDueDays_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Accounts Receivable Range Receivables Due Days </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_AccountsReceivableRangeReceivablesDueDays_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Accounts receivable, approximate range receivables due, days outstanding. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Allowance for Doubtful Accounts Receivable, Current </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Accounts Receivable, Allowance for Credit Loss, Current </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Cash and Cash Equivalents, at Carrying Value, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Cash and cash equivalents </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Cash and Cash Equivalents, at Carrying Value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Stock repurchase program, number of shares authorized to be repurchased </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Stock Repurchase Program, Number of Shares Authorized to be Repurchased </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Earnings per Share </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Earnings Per Share [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementClassOfStockAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Class of Stock </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementClassOfStockAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Class of Stock [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LossContingencyEstimateOfPossibleLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Amount reserved for litigation </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LossContingencyEstimateOfPossibleLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Loss Contingency, Estimate of Possible Loss </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentMaturityDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Debt instrument, maturity date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentMaturityDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt Instrument, Maturity Date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Revenues_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Revenues, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Revenues_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Net sales </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Revenues_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Revenues </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensation_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Share-Based Payment Arrangement, Noncash Expense, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensation_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Share-based compensation expense </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensation_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Payment Arrangement, Noncash Expense </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_GainOnSaleOfCertainClosedFacilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Gain on sale of certain closed facilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_GainOnSaleOfCertainClosedFacilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Gain On Sale Of Certain Closed Facilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_GainOnSaleOfCertainClosedFacilities_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Gain on sale of certain closed facilities. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Statement of Comprehensive Income [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentNet_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Property, plant and equipment, net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Property, plant and equipment, net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Property, Plant and Equipment, Net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseRightOfUseAssetAmortization_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Amortization of lease assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseRightOfUseAssetAmortization_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Finance Lease, Right-of-Use Asset, Amortization </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Award Type </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Award Type [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Statement [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Statement [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanSettlementsBenefitObligation_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanSettlementsBenefitObligation_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Settlements </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanSettlementsBenefitObligation_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PercentageOfEmployeesWorkingUnderExpiredCollectiveBargainingAgreement_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Percentage of Employees Working Under Expired Collective Bargaining Agreement </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PercentageOfEmployeesWorkingUnderExpiredCollectiveBargainingAgreement_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Percentage Of Employees Working Under Expired Collective Bargaining Agreement </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PercentageOfEmployeesWorkingUnderExpiredCollectiveBargainingAgreement_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Percentage of employees working under expired collective bargaining agreement. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_FutureMexicanPesoSubFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Future Mexican Peso Sub-Facility [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_FutureMexicanPesoSubFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Future Mexican Peso Sub Facility [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_FutureMexicanPesoSubFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Future Mexican Peso Sub-Facility [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GoodwillPurchaseAccountingAdjustments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Purchase price allocation adjustments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GoodwillPurchaseAccountingAdjustments_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Goodwill, Purchase Accounting Adjustments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_Security12bTitle_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Title of 12(b) Security </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_Security12bTitle_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Title of 12(b) Security </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsGross_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Finite-Lived Intangible Assets, Gross, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsGross_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Gross Carrying Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsGross_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Finite-Lived Intangible Assets, Gross </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Current income taxes: </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Current Income Tax Expense (Benefit), Continuing Operations [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInAccountsPayable_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Increase (Decrease) in Accounts Payable, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInAccountsPayable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Accounts payable </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInAccountsPayable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Increase (Decrease) in Accounts Payable </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherOperatingActivitiesCashFlowStatement_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Other </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherOperatingActivitiesCashFlowStatement_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Operating Activities, Cash Flow Statement </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_AdjustmenttoFairValueDebtAssumedinBusinessCombination_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Fair value step-up </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_AdjustmenttoFairValueDebtAssumedinBusinessCombination_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Adjustmentto Fair Value Debt Assumedin Business Combination </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_AdjustmenttoFairValueDebtAssumedinBusinessCombination_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Adjustment to fair value debt assumed in business combination. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_AffiliatedEntityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Affiliated Entity [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_AffiliatedEntityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Affiliated Entity [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestructuringCostAndReserveLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Restructuring Cost And Reserve [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestructuringCostAndReserveLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restructuring Cost and Reserve [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Common Stock [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Common Stock [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeNotionalAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Amount of foreign exchange contracts </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeNotionalAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Derivative, Notional Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeNotionalAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Derivative, Notional Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DebtAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DebtAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Debt. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Net actuarial (loss) gain arising during period, Net of Tax Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Net actuarial (loss) gain arising during period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Operating activities: </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Net Cash Provided by (Used in) Operating Activities [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Defined Benefit Plans And Other Postretirement Benefit Plans Disclosures [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquityComponentDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Equity Component </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquityComponentDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Equity Component [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Net sales </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Net sales </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Revenue from Contract with Customer, Excluding Assessed Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Income (loss) before income taxes </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Income (loss) before income taxes </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Finance Leases, Less: Interest </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Finance Lease, Liability, Undiscounted Excess Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_IncreaseInDiscountRateToEstimatedFairValueOfReportingUnitToFallBelowItsCarryingValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Increase in discount rate for the estimated fair value of reporting unit to fall below its carrying value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_IncreaseInDiscountRateToEstimatedFairValueOfReportingUnitToFallBelowItsCarryingValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Increase In Discount Rate To estimated Fair Value Of reporting Unit To Fall Below Its Carrying value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_IncreaseInDiscountRateToEstimatedFairValueOfReportingUnitToFallBelowItsCarryingValue_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Increase in discount rate to estimated fair value of reporting unit to fall below its carrying value. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressStateOrProvince_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Entity Address, State or Province </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressStateOrProvince_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Entity Address, State or Province </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Operating Leases, Fiscal 2026 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Lessee, Operating Lease, Liability, to be Paid, Year Four </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_StatementGeographicalAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Geographical </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_StatementGeographicalAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Geographical [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentContinuingOperationsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Continuing Operations [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentContinuingOperationsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Continuing Operations [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DebtInstrumentMaximumBorrowingCapacityAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Debt instrument, maximum borrowing capacity, amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DebtInstrumentMaximumBorrowingCapacityAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt Instrument Maximum Borrowing Capacity Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DebtInstrumentMaximumBorrowingCapacityAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Debt instrument maximum borrowing capacity amount. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SeniorUnsecuredDebtMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Senior Unsecured Debt [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SeniorUnsecuredDebtMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Senior Unsecured Debt [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SeniorUnsecuredDebtMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Senior unsecured debt [Member]. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> (Decrease) increase in cash, cash equivalents and restricted cash </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Comprehensive income (loss) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentType_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Document Type </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentType_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Document Type </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestPaidNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Interest, net of amounts capitalized </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestPaidNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Interest Paid, Excluding Capitalized Interest, Operating Activities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_IncreaseDecreaseToNonredeemableNoncontrollingInterestsFromDistributionsAndAdjustments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Distributions and adjustments to noncontrolling interests </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_IncreaseDecreaseToNonredeemableNoncontrollingInterestsFromDistributionsAndAdjustments_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Increase Decrease To Nonredeemable Noncontrolling Interests From Distributions And Adjustments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_IncreaseDecreaseToNonredeemableNoncontrollingInterestsFromDistributionsAndAdjustments_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Increase/(decrease) to nonredeemable noncontrolling interests from distributions and adjustments. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LitigationStatusDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Litigation Status </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LitigationStatusDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Litigation Status [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="country_US_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> United States [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="country_US_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> UNITED STATES </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Amortization of net actuarial loss (gain) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Amortization of Gain (Loss) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityShellCompany_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Entity Shell Company </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityShellCompany_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Entity Shell Company </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativesPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Derivatives </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativesPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Derivatives, Policy [Policy Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Prior service (credit) cost </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInInventories_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Increase (Decrease) in Inventories, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInInventories_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Inventories </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInInventories_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Increase (Decrease) in Inventories </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AllocatedShareBasedCompensationExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Allocated Share-based Compensation Expense </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AllocatedShareBasedCompensationExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Payment Arrangement, Expense </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentReportingInformationLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Segment Reporting Information [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentReportingInformationLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Segment Reporting Information [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueOfFinancialInstrumentsPolicy_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Fair Value of Financial Instruments and Nonfinancial Assets and Liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueOfFinancialInstrumentsPolicy_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Fair Value of Financial Instruments, Policy [Policy Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccrualForEnvironmentalLossContingencies_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Accrual for Environmental Loss Contingencies, Ending Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccrualForEnvironmentalLossContingencies_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel"> Accrual for Environmental Loss Contingencies, Beginning Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccrualForEnvironmentalLossContingencies_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Accrual for Environmental Loss Contingencies, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccrualForEnvironmentalLossContingencies_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Accrual for Environmental Loss Contingencies </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccrualForEnvironmentalLossContingencies_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Accrual for Environmental Loss Contingencies </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShortTermDebtMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Unsecured Short Term Debt [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShortTermDebtMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Short-Term Debt [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestructuringAndRelatedActivitiesAndOtherCostsDisclosureTextBlockTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Restructuring and Other Costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestructuringAndRelatedActivitiesAndOtherCostsDisclosureTextBlockTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restructuring And Related Activities And Other Costs Disclosure Text Block [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestructuringAndRelatedActivitiesAndOtherCostsDisclosureTextBlockTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Restructuring and related activities and other costs disclosure. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockTargetAwards2019Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Restricted Stock, Target Awards, 2019 [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockTargetAwards2019Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restricted Stock Target Awards 2019 [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockTargetAwards2019Member_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Restricted Stock Target Awards 2019. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_AggregatePrincipalAmountOfShortTermUnsecuredCommercialPaperProgramMaximum_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Aggregate Principal Amount of Short-term Unsecured Commercial Paper Program, Maximum </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_AggregatePrincipalAmountOfShortTermUnsecuredCommercialPaperProgramMaximum_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Aggregate Principal Amount Of Short Term Unsecured Commercial Paper Program Maximum </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_AggregatePrincipalAmountOfShortTermUnsecuredCommercialPaperProgramMaximum_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Aggregate principal amount of short-term unsecured commercial paper program maximum. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_VendorFinancingAndCommercialCardProgramsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Vendor Financing and Commercial Card Programs [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_VendorFinancingAndCommercialCardProgramsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Vendor Financing And Commercial Card Programs [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_VendorFinancingAndCommercialCardProgramsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Vendor financing and commercial card programs. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanYearHealthCareCostTrendRateReachesUltimateTrendRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Year the rate reaches the ultimate trend rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanYearHealthCareCostTrendRateReachesUltimateTrendRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccrualForEnvironmentalLossContingenciesGross_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Accrual for Environmental Loss Contingencies </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccrualForEnvironmentalLossContingenciesGross_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Accrual for Environmental Loss Contingencies, Gross </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccrualForEnvironmentalLossContingenciesGross_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Accrual for Environmental Loss Contingencies, Gross, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanBenefitObligationBenefitsPaid_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Benefits paid </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanBenefitObligationBenefitsPaid_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Benefit Obligation, Benefits Paid </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Fair Value, Recurring and Nonrecurring [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_MultiemployerPlansWithdrawalObligationPerMonth_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Withdrawal obligation, per month </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_MultiemployerPlansWithdrawalObligationPerMonth_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Multiemployer Plans Withdrawal Obligation Per Month </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_MultiemployerPlansWithdrawalObligationPerMonth_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Multiemployer plans withdrawal obligation per month. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PanamaCityMillMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Panama City Mill [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PanamaCityMillMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Panama city mill. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DebtInstrumentNoticePeriodForTermination_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Debt Instrument, notice period for termination </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DebtInstrumentNoticePeriodForTermination_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt Instrument Notice Period For Termination </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DebtInstrumentNoticePeriodForTermination_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Debt instrument notice period for termination. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanPlanAssetsBenefitsPaid_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Benefits paid </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanPlanAssetsBenefitsPaid_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Plan Assets, Benefits Paid </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Additions related to purchase accounting </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Unrecognized Tax Benefits, Increase Resulting from Acquisition </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LandAndDevelopmentSales_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Land and development sales </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LandAndDevelopmentSales_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Land And Development Sales </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LandAndDevelopmentSales_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Land and development sales. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsNetOfTax_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Reclassification of stranded tax effects </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Reclassification of stranded tax effects net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Tax Cuts And Jobs Act Of2017 Reclassification From Aoci To Retained Earnings Net Of Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Tax cuts and jobs act of 2017 reclassification from aoci to retained earnings net of tax. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_NorthAmericaMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> North America [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_NorthAmericaMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> North America [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Reclassification Out Of Accumulated Other Comprehensive Income [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Reclassification out of Accumulated Other Comprehensive Income [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_AdjustmentToPri2012MortalityTablesWithSpecificGenderAndJobClassification_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Adjustment to Pri-2012 mortality tables with specific gender and job classification </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_AdjustmentToPri2012MortalityTablesWithSpecificGenderAndJobClassification_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Adjustment To Pri2012 Mortality Tables With Specific Gender And Job Classification </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_AdjustmentToPri2012MortalityTablesWithSpecificGenderAndJobClassification_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Adjustment to Pri-2012 mortality tables with specific gender and job classification. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_SecurityExchangeName_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Security Exchange Name </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_SecurityExchangeName_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Security Exchange Name </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DirectCostsAndPropertyDamageInsuranceRecovery_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Insurance proceeds for direct costs and property damage </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DirectCostsAndPropertyDamageInsuranceRecovery_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Direct Costs And Property Damage Insurance Recovery </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DirectCostsAndPropertyDamageInsuranceRecovery_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Direct costs and property damage insurance recovery. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Goodwill and Long-Lived Assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Goodwill and Intangible Assets, Policy [Policy Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueFromContractWithCustomerAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Revenue from Contract with Customer [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Noncurrent finance lease liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Finance Lease, Liability, Noncurrent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LoansReceivableAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Loans Receivable </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LoansReceivableAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Loans Receivable [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LoansReceivableAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Loans Receivable [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Net cash provided by operating activities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Net Cash Provided by (Used in) Operating Activities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Weighted Average Remaining Contractual Term (in years), Outstanding </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueByBalanceSheetGroupingTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Fair Value By Balance Sheet Grouping [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueByBalanceSheetGroupingTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Fair Value, by Balance Sheet Grouping [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DebtInstrumentAmendedMaturityDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Debt instrument, amended maturity date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DebtInstrumentAmendedMaturityDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt Instrument Amended Maturity Date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DebtInstrumentAmendedMaturityDate_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Debt instrument amended maturity date. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Other comprehensive (loss) income, net of tax: </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Comprehensive Income (Loss), Net of Tax [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseCost_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Operating lease costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseCost_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating Lease, Cost </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Other comprehensive (loss) income attributable to common stockholders, Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TimberNoteMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Timber Note [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TimberNoteMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Timber Note [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TimberNoteMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Timber Note [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Finance Leases, Fiscal 2024 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Finance Lease, Liability, to be Paid, Year Two </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ReductionOfCostOfGoodsSold_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Reduction of cost of goods sold </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ReductionOfCostOfGoodsSold_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Reduction Of Cost Of Goods Sold </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ReductionOfCostOfGoodsSold_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Reduction of cost of goods sold. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PercentageofPerformanceBasedAwardsReflected_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Percentage of Performance Based Awards Reflected </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PercentageofPerformanceBasedAwardsReflected_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Percentageof Performance Based Awards Reflected </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PercentageofPerformanceBasedAwardsReflected_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Percentage of Performance Based Awards Reflected </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SharebasedCompensationArrangementbySharebasedPaymentAwardContractualTermMaximum1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Share-based Compensation Arrangement by Share-based Payment Award, Contractual Term, Maximum </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SharebasedCompensationArrangementbySharebasedPaymentAwardContractualTermMaximum1_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Sharebased Compensation Arrangementby Sharebased Payment Award Contractual Term Maximum1 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SharebasedCompensationArrangementbySharebasedPaymentAwardContractualTermMaximum1_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Share-based Compensation Arrangement by Share-based Payment Award, Contractual Term, Maximum </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanActuarialGainLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Actuarial loss (gain) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanActuarialGainLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Change in valuation allowance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Summary of Changes in Stock Options </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Payment Arrangement, Option, Activity [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> New Accounting Standards - Recently Adopted and Pending to be Adopted </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> New Accounting Pronouncements, Policy [Policy Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ReceivablesPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Accounts Receivables and Allownanes </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ReceivablesPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Receivable [Policy Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule Of Defined Benefit Plans Disclosures [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Defined Benefit Plans Disclosures [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Common Stock, Shares, Outstanding </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel"> Beginning balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Ending balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Common Stock, Shares, Outstanding </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TransactionExpectedToCloseInEarlySubjectToSatisfactionOfCustomary_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Transaction expected to close in early subject to satisfaction of customary </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TransactionExpectedToCloseInEarlySubjectToSatisfactionOfCustomary_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Transaction Expected to Close in Early Subject to Satisfaction of Customary </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TransactionExpectedToCloseInEarlySubjectToSatisfactionOfCustomary_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Transaction expected to close in early subject to satisfaction of customary. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Business Acquisition [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Business Acquisition [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainsLossesOnExtinguishmentOfDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Gain (Loss) on Extinguishment of Debt, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainsLossesOnExtinguishmentOfDebt_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Loss on extinguishment of debt </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainsLossesOnExtinguishmentOfDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Loss on extinguishment of debt </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainsLossesOnExtinguishmentOfDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Gain (Loss) on Extinguishment of Debt </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_UnamortizedFairMarketValueStepUpWeightedAverageRemainingLife_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Unamortized fair market value step-up, weighted average remaining life </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_UnamortizedFairMarketValueStepUpWeightedAverageRemainingLife_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Unamortized Fair Market Value Step Up Weighted Average Remaining Life </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_UnamortizedFairMarketValueStepUpWeightedAverageRemainingLife_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Unamortized Fair Market Value Step-Up, Weighted Average Remaining Life </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Debt </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt Disclosure [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DeferredTaxAssetsEmployeeRelatedAccrualsAndAllowances_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Employee related accruals and allowances </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DeferredTaxAssetsEmployeeRelatedAccrualsAndAllowances_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax Assets Employee Related Accruals And Allowances </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DeferredTaxAssetsEmployeeRelatedAccrualsAndAllowances_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Deferred tax assets, employee related accruals and allowances. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueInputsLevel2Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Fair Value, Inputs, Level 2 [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueInputsLevel2Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Fair Value, Inputs, Level 2 [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromIssuanceOfLongTermDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Proceeds from Issuance of Long-Term Debt, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromIssuanceOfLongTermDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Proceeds from issuance of notes </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromIssuanceOfLongTermDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Proceeds from Issuance of Long-Term Debt </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestructuringAndOtherCostsReserve_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel"> Accrual at beginning of fiscal year </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestructuringAndOtherCostsReserve_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Accrual at end of fiscal year </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestructuringAndOtherCostsReserve_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restructuring And Other Costs Reserve </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestructuringAndOtherCostsReserve_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Restructuring and other costs reserve. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Investing activities: </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Net Cash Provided by (Used in) Investing Activities [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TransfersOfFinancialAssetsAccountedForAsSaleInitialFairValueOfAssetsObtainedAsProceeds_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Receivables sold to the financial institutions and derecognized </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TransfersOfFinancialAssetsAccountedForAsSaleInitialFairValueOfAssetsObtainedAsProceeds_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Transfers of Financial Assets Accounted for as Sale, Initial Fair Value of Assets Obtained as Proceeds </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Estimated Intangible Asset Amortization Expense </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_BankOfAmericaFiveYearTermLoanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Bank of America Five Year Term Loan [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_BankOfAmericaFiveYearTermLoanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Bank Of America Five Year Term Loan [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_BankOfAmericaFiveYearTermLoanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Bank of America five year term loan. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Additions for tax positions taken in current year </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommitmentsAndContingencies_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Commitments and contingencies (Note 17) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommitmentsAndContingencies_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Commitments and Contingencies </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxAuthorityNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Income Tax Authority, Name </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxAuthorityNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Income Tax Authority, Name [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsidiaryOfCommonParentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Subsidiary [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsidiaryOfCommonParentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Subsidiary of Common Parent [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Income taxes </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Increase (Decrease) in Income Taxes Payable, Net of Income Taxes Receivable </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPensionPlanLiabilitiesNoncurrent_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Pension liabilities, net of current portion </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPensionPlanLiabilitiesNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Pension liabilities, net of current portion </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPensionPlanLiabilitiesNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Liability, Defined Benefit Pension Plan, Noncurrent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_MaturityOfLeaseLiabilitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Maturity Of Lease Liabilities [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_MaturityOfLeaseLiabilitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Maturity of lease liabilities. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_BrazilDelayedDrawCreditFacilitiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Brazil Delayed Draw Credit Facilities [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_BrazilDelayedDrawCreditFacilitiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Brazil Delayed Draw Credit Facilities [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_BrazilDelayedDrawCreditFacilitiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Brazil delayed draw credit facilities. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LineOfCreditFacilityInitialDrawdownPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Credit facility initial drowdowns period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LineOfCreditFacilityInitialDrawdownPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Line Of Credit Facility Initial Drawdown Period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LineOfCreditFacilityInitialDrawdownPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Line of credit facility initial drawdown period. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_VariableRateDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Variable Rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_VariableRateDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Variable Rate [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Deferred loss on cash flow hedges </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Deferred loss on cash flow hedges, Net of Tax Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MinimumMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Minimum [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MinimumMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Minimum [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfRestructuringAndRelatedCostsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule of Restructuring Charges Related to Active Restructuring Initiatives </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfRestructuringAndRelatedCostsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restructuring and Related Costs [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxAuthorityNameAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Income Tax Authority, Name </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxAuthorityNameAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Income Tax Authority, Name [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NumberOfSubsidiaries_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Number of subsidiaries </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NumberOfSubsidiaries_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Number Of Subsidiaries </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NumberOfSubsidiaries_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Number of subsidiaries. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DefinedContributionPlanEmployerContributiononBasicSalaryEmployeesCoveredunderaCBAMaximumLowEndofRange_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Defined Contribution Plan Employer Contribution on Basic Salary, Employees Covered under a CBA, Maximum, Low End of Range </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DefinedContributionPlanEmployerContributiononBasicSalaryEmployeesCoveredunderaCBAMaximumLowEndofRange_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Contribution Plan Employer Contributionon Basic Salary Employees Coveredundera C B A Maximum Low Endof Range </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DefinedContributionPlanEmployerContributiononBasicSalaryEmployeesCoveredunderaCBAMaximumLowEndofRange_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Defined contribution plan employer contribution on basic salary, employees covered under a CBA, maximum, low end of range. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationGainLossArisingDuringPeriodTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Foreign currency translation (loss) gain, Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationGainLossArisingDuringPeriodTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> OCI, Foreign Currency Transaction and Translation Gain (Loss), Arising During Period, Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CapitalAdditionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Capital Addition Purchase Commitments [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CapitalAdditionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Capital Addition Purchase Commitments [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockNonEmployeeDirectorsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Restricted Stock, Non-Employee Directors [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockNonEmployeeDirectorsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restricted Stock Non Employee Directors [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockNonEmployeeDirectorsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Restricted Stock, Non-Employee Directors [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_InterestRateTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Interest Rate Type </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_InterestRateTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Interest Rate Type [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_InterestRateTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Interest Rate Type [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Segments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Segments [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Deferred rate change </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeLeasesPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Leased Assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeLeasesPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Lessee, Leases [Policy Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Weighted Average Exercise Price, exercisable at end of period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RepaymentsOfLinesOfCredit_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Repayments of revolving credit facilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RepaymentsOfLinesOfCredit_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Repayments of Lines of Credit </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Accounting Standards Update </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Accounting Standards Update [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherRestructuringCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Other restructuring costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherRestructuringCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Restructuring Costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DeferredTaxLiabilityBookTaxBasisDifferenceInJointVentures_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Basis difference in joint ventures </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DeferredTaxLiabilityBookTaxBasisDifferenceInJointVentures_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax Liability Book Tax Basis Difference In Joint Ventures </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DeferredTaxLiabilityBookTaxBasisDifferenceInJointVentures_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Deferred tax liability, book/tax basis difference in joint ventures. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MortgageBackedSecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Collateralized Mortgage Backed Securities [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MortgageBackedSecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Collateralized Mortgage-Backed Securities [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Debt Instrument </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt Instrument [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> State taxes, net of federal benefit </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SeniorNotesDueTwoThousandAndTwentyFiveMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Senior Notes due 2025 [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SeniorNotesDueTwoThousandAndTwentyFiveMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Senior Notes Due Two Thousand And Twenty Five [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SeniorNotesDueTwoThousandAndTwentyFiveMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Senior notes due two thousand and twenty five. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DebtInstrumentMaturityYear_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Debt instrument, maturity year </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DebtInstrumentMaturityYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt Instrument Maturity Year </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DebtInstrumentMaturityYear_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Debt instrument maturity year. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherIntangibleAssetsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Other [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherIntangibleAssetsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Intangible Assets [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementBusinessSegmentsAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Segments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementBusinessSegmentsAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Segments [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CurrentForeignTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Foreign </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CurrentForeignTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Current Foreign Tax Expense (Benefit) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LegacyReportableCorrugatedPackagingSegmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Legacy Reportable Corrugated Packaging Segment [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LegacyReportableCorrugatedPackagingSegmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Legacy reportable corrugated packaging segment. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Actual (loss) gain on plan assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Foreign Currency </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Foreign Currency Transactions and Translations Policy [Policy Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Weighted Average Grant Date Fair Value, Forfeited </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxExaminationLiabilityRefundAdjustmentFromSettlementWithTaxingAuthority_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Income tax settlement claim liability </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxExaminationLiabilityRefundAdjustmentFromSettlementWithTaxingAuthority_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AmortizationOfIntangibleAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Intangible Assets Amortization Expense </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AmortizationOfIntangibleAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Amortization of Intangible Assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AwardTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Award Type </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AwardTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Award Type [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ApproximateTonsOfPaperDiverted_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Approximate tons of paper diverted </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ApproximateTonsOfPaperDiverted_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Approximate Tons Of Paper Diverted </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ApproximateTonsOfPaperDiverted_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Approximate tons of paper diverted. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Employee Service Share-based Compensation, Unvested Awards, Compensation Cost Not yet Recognized </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_USRevolvingFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> U.S. Revolving Facility [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_USRevolvingFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> U.S. Revolving Facility [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_USRevolvingFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> U.S. revolving facility [Member]. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Debt Instrument, Fair Value Disclosure, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Fair value of debt </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt Instrument, Fair Value Disclosure </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetirementPlanNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Retirement Plan Name </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetirementPlanNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Retirement Plan Name [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestructuringAndRelatedCostExpectedCost1_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Restructuring and Related Cost, Expected Cost, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestructuringAndRelatedCostExpectedCost1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Restructuring and Related Cost, Expected Cost </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestructuringAndRelatedCostExpectedCost1_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restructuring and Related Cost, Expected Cost </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsGross_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Deferred Tax Assets, Gross </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsGross_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax Assets, Gross </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Aggregate intrinsic value of options exercised </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherNonoperatingIncomeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Other (expense) income, net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherNonoperatingIncomeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Other Nonoperating Income (Expense), Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherNonoperatingIncomeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Nonoperating Income (Expense) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Less: Distributed and undistributed income available to participating securities, Basic </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Participating Securities, Distributed and Undistributed Earnings (Loss), Basic </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Fiscal 2024 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Expected Future Benefit Payment, Year Two </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Operating Leases, Total lease payments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Lessee, Operating Lease, Liability, to be Paid </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestructuringCostAndReserveAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Restructuring Type </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestructuringCostAndReserveAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restructuring Type [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanPlanAssetsContributionsByPlanParticipant_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Plan participant contributions </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanPlanAssetsContributionsByPlanParticipant_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Plan Assets, Contributions by Plan Participant </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Reductions for tax positions taken in prior fiscal years </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SellingGeneralAndAdministrativeIntangibleAmortization_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Selling, general and administrative intangible amortization </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SellingGeneralAndAdministrativeIntangibleAmortization_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Selling General And Administrative Intangible Amortization </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SellingGeneralAndAdministrativeIntangibleAmortization_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Selling, general and administrative intangible amortization. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LandAndBuildingMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Land and Buildings [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LandAndBuildingMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Land and Building [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Cash and Cash Equivalents [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Cash and Cash Equivalents [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PriorFarmLoanCreditFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Prior Farm Loan Credit Facility [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PriorFarmLoanCreditFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Prior Farm Loan Credit Facility Member </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PriorFarmLoanCreditFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Prior farm loan credit facility. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_FairValueOfEquityIssuedInAcquisition_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Fair value of share-based awards issued in business combinations </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_FairValueOfEquityIssuedInAcquisition_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Fair Value Of Equity Issued In Acquisition </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_FairValueOfEquityIssuedInAcquisition_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Fair value of equity issued in acquisition. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityCentralIndexKey_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Entity Central Index Key </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityCentralIndexKey_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Entity Central Index Key </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityCentralIndexKey_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Entity Central Index Key </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_AnnualCapacityOfProduction_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Annual capacity of production </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_AnnualCapacityOfProduction_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Annual Capacity Of Production </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_AnnualCapacityOfProduction_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Annual capacity of production </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DebtInstrumentMaturityMonthAndYear_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Debt instrument maturity period in Month and year </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DebtInstrumentMaturityMonthAndYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt Instrument, Maturity, Month and Year </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DebtInstrumentMaturityMonthAndYear_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Debt instrument, maturity, month and year. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_CommitmentsAndContingenciesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Commitments and Contingencies [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_CommitmentsAndContingenciesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Commitments And Contingencies [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_CommitmentsAndContingenciesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Commitments and contingencies. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LineOfCreditFacilityPotentialIncreaseForPeriodNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Credit facility, amount of potential increase to the principal amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LineOfCreditFacilityPotentialIncreaseForPeriodNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Line Of Credit Facility Potential Increase For Period Net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LineOfCreditFacilityPotentialIncreaseForPeriodNet_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Line of credit facility potential increase for period net. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Finite Lived Intangible Assets [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Finite-Lived Intangible Assets [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GuaranteeObligationsCurrentCarryingValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Guarantor Obligations, Current Carrying Value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GuaranteeObligationsCurrentCarryingValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Guarantor Obligations, Current Carrying Value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictiononExclusionofEligibleReceivablesofSpecificObligorsObligorMaximumPercentageofAggregateBalance_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Restriction on Exclusion of Eligible Receivables of Specific Obligors, Obligor Maximum Percentage of Aggregate Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictiononExclusionofEligibleReceivablesofSpecificObligorsObligorMaximumPercentageofAggregateBalance_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restrictionon Exclusionof Eligible Receivablesof Specific Obligors Obligor Maximum Percentageof Aggregate Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictiononExclusionofEligibleReceivablesofSpecificObligorsObligorMaximumPercentageofAggregateBalance_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Restriction on Exclusion of Eligible Receivables of Specific Obligors, Obligor Maximum Percentage of Aggregate Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Defined Benefit Plan, Actual Plan Asset Allocations </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MajorCustomersAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Customer </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MajorCustomersAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Customer [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LostProductionFromRansomwareIncidentToDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Lost production from ransomware incident to date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LostProductionFromRansomwareIncidentToDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Lost Production From Ransomware Incident To Date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LostProductionFromRansomwareIncidentToDate_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Lost production from ransomware incident to date. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions and Methodology [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PropertyPlantAndEquipmentEstimatedUsefulLivesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Property, Plant and Equipment, Estimated Useful Lives </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PropertyPlantAndEquipmentEstimatedUsefulLivesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Property Plant And Equipment Estimated Useful Lives Table [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PropertyPlantAndEquipmentEstimatedUsefulLivesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Property, Plant and Equipment, Estimated Useful Lives [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_IncomeTaxesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Income Taxes [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_IncomeTaxesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Income Taxes [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_IncomeTaxesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Income taxes. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisaggregationOfRevenueLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Disaggregation Of Revenue [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisaggregationOfRevenueLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Disaggregation of Revenue [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel"> Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Beginning Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Less: accumulated depreciation, depletion and amortization </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule Of Property Plant And Equipment [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Property, Plant and Equipment [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Expected volatility </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Pension and other postretirement non-service income </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PropertyPlantAndEquipmentAndRelatedCostsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> PP&E and Related Costs [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PropertyPlantAndEquipmentAndRelatedCostsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Property, Plant and Equipment and Related Costs [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PropertyPlantAndEquipmentAndRelatedCostsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Property, plant and equipment and related costs. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Net other comprehensive loss (income) recognized </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Finance leases </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Finance Lease, Weighted Average Discount Rate, Percent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_BrazilExportCreditNoteMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Brazil Export Credit Note [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_BrazilExportCreditNoteMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Brazil Export Credit Note [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_BrazilExportCreditNoteMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Brazil export credit note. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OtherIntangibleAssetsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Intangible Assets [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OtherIntangibleAssetsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Other Intangible Assets [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NoncurrentAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Long-Lived Assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NoncurrentAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Long-Lived Assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueByMeasurementFrequencyAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Measurement Frequency </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueByMeasurementFrequencyAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Measurement Frequency [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Nondeductible transaction costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ConsolidationItemsDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Consolidation Items </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ConsolidationItemsDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Consolidation Items [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OperatingAndFinanceLeaseLiabilityPaymentsDueYearTwo_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Fiscal 2024 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OperatingAndFinanceLeaseLiabilityPaymentsDueYearTwo_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating And Finance Lease Liability Payments Due Year Two </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OperatingAndFinanceLeaseLiabilityPaymentsDueYearTwo_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Amount of lessee's undiscounted obligation for lease payments for operating and finance lease, due in second fiscal year following latest fiscal year. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Number of shares available for grant </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Shares Available For Future Grant </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Capacity available for special purpose </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Stock Based Compensation </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Payment Arrangement [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_EquityInIncomeLossOfUnconsolidatedEntities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Equity in income (loss) of unconsolidated entities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_EquityInIncomeLossOfUnconsolidatedEntities_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Equity in Income (loss) of Unconsolidated Entities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_EquityInIncomeLossOfUnconsolidatedEntities_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Equity in income (loss) of unconsolidated entities. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_UnamortizedFairMarketValueStepUp_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Unamortized fair market value step-up </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_UnamortizedFairMarketValueStepUp_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Unamortized Fair Market Value Step Up </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_UnamortizedFairMarketValueStepUp_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Unamortized Fair Market Value Step-Up </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DistributionSegmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Distribution [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DistributionSegmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Distribution Segment [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DistributionSegmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Distribution segment. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Subsequent Event [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RTSPackagingLLCMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> RTS Packaging, LLC [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RTSPackagingLLCMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> R T S Packaging, L L C [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RTSPackagingLLCMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> R T S packaging, L L C. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TaxClaimCoveringTaxYearsDescription_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Tax claim and conversion description </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TaxClaimCoveringTaxYearsDescription_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Tax Claim Covering Tax Years Description </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TaxClaimCoveringTaxYearsDescription_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Tax claim covering tax years description. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostCreditExcludingServiceCostStatementOfIncomeOrComprehensiveIncomeExtensibleList_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel"> Weighted Average Exercise Price, Outstanding </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Weighted Average Exercise Price, outstanding, end of period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeasePrincipalPayments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Financing cash flows related to finance leases </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeasePrincipalPayments_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Finance Lease, Principal Payments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Over (under) funded status at end of fiscal year </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_StockBasedCompensationAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Stock Based Compensation [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_StockBasedCompensationAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Stock Based Compensation [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ChargeOnNotExercisingOptionToPurchaseAdditionalEquityInterestInJointVenture_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Charge on not exercising option to purchase additional equity interest in joint venture </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ChargeOnNotExercisingOptionToPurchaseAdditionalEquityInterestInJointVenture_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Charge On Not Exercising Option To Purchase Additional Equity Interest In Joint Venture </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ChargeOnNotExercisingOptionToPurchaseAdditionalEquityInterestInJointVenture_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Charge on not exercising option to purchase additional equity interest in joint venture. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_SouthAmericaMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> South America [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_SouthAmericaMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> South America [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostCreditCurtailmentGainLossStatementOfIncomeOrComprehensiveIncomeExtensibleList_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Curtailment Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Less: Other comprehensive income (loss) attributable to noncontrolling interests, Pre-Tax Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Other Comprehensive Income (Loss), before Tax, Portion Attributable to Noncontrolling Interest, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Comprehensive Income (Loss), before Tax, Portion Attributable to Noncontrolling Interest </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecreaseAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Derivatives: </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecreaseAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ScenarioForecastMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Scenario Forecast [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ScenarioForecastMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Forecast [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LeaseCost_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Total lease cost, net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LeaseCost_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Lease, Cost </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Operating leases </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Right-of-Use Asset Obtained in Exchange for Operating Lease Liability </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Defined Contribution Plan Employer Contribution on Basic Salary, Matching Contribution </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestructuringAndOtherCostsReserveAccrualAdjustment_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Adjustment to accruals </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestructuringAndOtherCostsReserveAccrualAdjustment_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restructuring And Other Costs Reserve Accrual Adjustment </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestructuringAndOtherCostsReserveAccrualAdjustment_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Restructuring and other costs reserve, accrual adjustment. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Adjustments to reconcile consolidated net income (loss) to net cash provided by operating activities: </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanSettlementsPlanAssets_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Settlements </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanSettlementsPlanAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Plan Assets, Payment for Settlement </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquityLivesOfUnderlyingAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Equity Method Investment, Difference Between Carrying Amount and Underlying Equity, Lives of Underlying Assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquityLivesOfUnderlyingAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Equity Method Investment Difference Between Carrying Amount And Underlying Equity Lives Of Underlying Assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquityLivesOfUnderlyingAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Equity method investment, difference between carrying amount and underlying equity, lives of underlying assets. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule of Valuation and Qualifying Accounts Disclosure </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetainedEarningsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Retained Earnings [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetainedEarningsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Retained Earnings [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ExtinguishmentOfDebtTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Extinguishment of Debt, Type </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ExtinguishmentOfDebtTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Extinguishment of Debt, Type [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Defined Benefit Plans, Net of Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_MachineryAndEquipmentMillsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Machinery and Equipment, Mills [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_MachineryAndEquipmentMillsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Machinery And Equipment Mills [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_MachineryAndEquipmentMillsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Machinery and Equipment, Mills [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LossOnDerivativeInstrumentsPretax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Net Realized losses in cost of good sold </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LossOnDerivativeInstrumentsPretax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Loss on Derivative Instruments, Pretax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RevolvingCreditAndSwingFacilitiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Revolving Credit and Swing Facilities [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RevolvingCreditAndSwingFacilitiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Revolving Credit And Swing Facilities [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RevolvingCreditAndSwingFacilitiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Revolving credit and swing facilities. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeLossFromEquityMethodInvestments_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Equity in income of unconsolidated entities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeLossFromEquityMethodInvestments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Equity in income of unconsolidated entities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeLossFromEquityMethodInvestments_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Income (Loss) from Equity Method Investments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnsecuredDebtMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Unsecured Debt [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnsecuredDebtMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Unsecured Debt [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Business acquisition, number of shares issued </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Business Acquisition, Equity Interest Issued or Issuable, Number of Shares </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Business Acquisition, Equity Interest Issued or Issuable, Number of Shares </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_NameOfMajorCustomerDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Customer </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_NameOfMajorCustomerDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Customer [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentReportingAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Segment Reporting [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanPlanAssetsForeignCurrencyTranslationGainLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Foreign currency rate changes </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanPlanAssetsForeignCurrencyTranslationGainLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateContinuingOperations_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Effective tax rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateContinuingOperations_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Effective Income Tax Rate Reconciliation, Percent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_AmendedAndRestatedTwoThousandSixteenIncentiveStockPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Amended and Restated 2016 Incentive Stock Plan [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_AmendedAndRestatedTwoThousandSixteenIncentiveStockPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Amended And Restated Two Thousand Sixteen Incentive Stock Plan [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_AmendedAndRestatedTwoThousandSixteenIncentiveStockPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Amended and restated two thousand sixteen incentive stock plan. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Total Reclassifications From Other Comprehensive Income Before Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Reclassification from AOCI, Current Period, before Tax, Attributable to Parent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainLossOnSaleOfPropertyPlantEquipment_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> (Gain) loss on disposal of plant, equipment and other, net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainLossOnSaleOfPropertyPlantEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Gain (Loss) on Disposition of Property Plant Equipment, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainLossOnSaleOfPropertyPlantEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Gain (Loss) on Disposition of Property Plant Equipment </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfGoodwillTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule Of Goodwill [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfGoodwillTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Goodwill [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> SOFR Loans [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OtherFixedIncomeSecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Other Fixed Income Securities [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OtherFixedIncomeSecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Fixed Income Securities [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OtherFixedIncomeSecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Other fixed income securities. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Business Combination, Consideration Transferred, Equity Interests Issued and Issuable </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Business Combination, Consideration Transferred, Equity Interests Issued and Issuable </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentGross_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Property, Plant and Equipment, Gross, Ending Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentGross_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel"> Property, Plant and Equipment, Gross, Beginning Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentGross_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Property, Plant and Equipment, Gross, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentGross_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Property, plant and equipment, at cost </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentGross_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Property, Plant and Equipment, Gross </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GoodwillAcquiredDuringPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Goodwill acquired </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GoodwillAcquiredDuringPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Goodwill, Acquired During Period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Thereafter </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Long-Term Debt, Maturity, after Year Five </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SecuredFinancingLiabilityMaturityinDecember2023Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Secured Financing Liability, Maturity in December 2023 [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SecuredFinancingLiabilityMaturityinDecember2023Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Secured Financing Liability Maturityin December2023 [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SecuredFinancingLiabilityMaturityinDecember2023Member_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Secured Financing Liability, Maturity in December 2023 [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Percentage of awards vested </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TaxCreditCarryforwardYearsToExpiration_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Tax Credit Carryforward, Years to Expiration </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TaxCreditCarryforwardYearsToExpiration_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Tax Credit Carryforward Years To Expiration </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TaxCreditCarryforwardYearsToExpiration_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Tax credit carryforward, years to expiration. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityInteractiveDataCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Entity Interactive Data Current </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityInteractiveDataCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Entity Interactive Data Current </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityPublicFloat_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Entity Public Float </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityPublicFloat_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Entity Public Float </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetPledgedAsCollateralMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Collateralizing [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetPledgedAsCollateralMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Asset Pledged as Collateral [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NewReportableConsumerPackagingSegmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> New Reportable Consumer Packaging Segment [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NewReportableConsumerPackagingSegmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> New reportable consumer packaging segment. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_EffectiveIncomeTaxRateReconciliationForeignDerivedIntangibleIncomePercent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Foreign derived intangible income </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_EffectiveIncomeTaxRateReconciliationForeignDerivedIntangibleIncomePercent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Effective Income Tax Rate Reconciliation Foreign Derived Intangible Income Percent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_EffectiveIncomeTaxRateReconciliationForeignDerivedIntangibleIncomePercent_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Effective income tax rate reconciliation, foreign derived intangible income, percent. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyTransactionsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Related Party Transactions </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyTransactionsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Related Party Transactions Disclosure [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_WellsFargoBankNACreditFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Wells Fargo Bank NA Credit Facility [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_WellsFargoBankNACreditFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Wells Fargo Bank N A Credit Facility [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_WellsFargoBankNACreditFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Wells Fargo bank NA credit facility. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LettersOfCreditOutstandingAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Letters of credit outstanding, amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LettersOfCreditOutstandingAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Letters of Credit Outstanding, Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IntersegmentEliminationMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Intersegment Eliminations [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IntersegmentEliminationMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Intersegment Sales [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IntersegmentEliminationMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Intersegment Eliminations [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_UncoatedRecycledPaperboardMillsSubjectToWorkingCapitalAdjustment_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Sale of uncoated recycled paperboard mills subject to working capital adjustment </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_UncoatedRecycledPaperboardMillsSubjectToWorkingCapitalAdjustment_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Uncoated Recycled Paperboard Mills Subject to Working Capital Adjustment </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_UncoatedRecycledPaperboardMillsSubjectToWorkingCapitalAdjustment_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> uncoated recycled paperboard mills subject to working capital adjustment. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LIBORBasedBorrowingsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> LIBOR Based Borrowings [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LIBORBasedBorrowingsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> L I B O R Based Borrowings [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LIBORBasedBorrowingsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> LIBOR Based Borrowings [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_BasisOfPresentationAndPrinciplesOfConsolidationPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Basis of Presentation and Principles of Consolidation </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_BasisOfPresentationAndPrinciplesOfConsolidationPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Basis Of Presentation And Principles Of Consolidation Policy [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_BasisOfPresentationAndPrinciplesOfConsolidationPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Basis of presentation and principles of consolidation. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyTransactionsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Related Party Transactions [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentOperatingActivitiesDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Operating Activities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentOperatingActivitiesDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating Activities [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Expected long-term rate of return on plan assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-Term Rate of Return on Plan Assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_EstimatedLossOnSaleOfAccountsReceivableForFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Estimated loss on sale of accounts receivable in a fiscal year </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_EstimatedLossOnSaleOfAccountsReceivableForFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Estimated Loss On Sale Of Accounts Receivable For Fiscal Year </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_EstimatedLossOnSaleOfAccountsReceivableForFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Estimated loss on sale of accounts receivable for fiscal year. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MiningPropertiesAndMineralRightsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Mineral Rights [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MiningPropertiesAndMineralRightsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Mining Properties and Mineral Rights [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PercentageOfEmployeesCoveredByCollectiveBargainingAgreements_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Percentage of Employees Covered by Collective Bargaining Agreements </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PercentageOfEmployeesCoveredByCollectiveBargainingAgreements_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Percentage Of Employees Covered By Collective Bargaining Agreements </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PercentageOfEmployeesCoveredByCollectiveBargainingAgreements_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Percentage of employees covered by collective bargaining agreements. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Operating Leases, Fiscal 2023 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Lessee, Operating Lease, Liability, to be Paid, Year One </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel"> Amortization and settlement recognition of net actuarial loss, included in pension cost </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Amortization and settlement recognition of net actuarial loss, included in pension and postretirement cost </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAssumptionsUsedTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule of Weighted-Average Assumptions Used </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAssumptionsUsedTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Assumptions [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Federal and foreign net operating loss carryforwards </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax Assets, Operating Loss Carryforwards, Foreign </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LeaseholdImprovementsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Leasehold Improvements [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LeaseholdImprovementsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Leasehold Improvements [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Deferred income taxes: </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PensionFundingMoreLessThanExpense_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Pension and other postretirement funding more than expense (income) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PensionFundingMoreLessThanExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Pension Funding More Less Than Expense </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PensionFundingMoreLessThanExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> The amount of pension benefit costs and postretirement benefit costs recognized during the period for defined benefit and defined contribution plans, less the amount of cash or cash equivalents contributed by the entity to fund its pension plans. For defined benefit plans, pension expense includes the following components: service cost, interest cost, expected return on plan assets, gain or loss on plan assets, prior service cost or credit, transition asset or obligation, and gain or loss due to settlements or curtailments. For defined contribution plans, the pension expense generally equals the firm's contribution to employees' accounts (if the firm contributes) during the period. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_LocalPhoneNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Local Phone Number </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_LocalPhoneNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Local Phone Number </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Statutory federal tax rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Statutory tax rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SegmentInformationAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Segment Information [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SegmentInformationAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Segment Information [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_FarmCreditFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Farm Credit Facility [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_FarmCreditFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Farm Credit Facility [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_FarmCreditFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Farm Credit Facility [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefits_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Balance at end of fiscal year </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefits_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel"> Balance at beginning of fiscal year </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefits_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Balance at end of fiscal year </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefits_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Unrecognized Tax Benefits </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockTargetAwards2018Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Restricted Stock, Target Awards, 2018 [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockTargetAwards2018Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restricted Stock Target Awards2018 [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockTargetAwards2018Member_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Restricted stock target awards 2018. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueAssetsMeasuredOnRecurringBasisTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Summary of Pension Plan Assets Measured at Fair Value on Recurring Basis </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueAssetsMeasuredOnRecurringBasisTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Fair Value, Assets Measured on Recurring Basis [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Revenues from External Customers and Long-Lived Assets [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Revenues from External Customers and Long-Lived Assets [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule of Earnings Per Share, Basic and Diluted </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_CooperatieveRabobankUANewYorkBranchRevolvingLineofCreditMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Cooperatieve Rabobank U.A., New York Branch European Revolving Credit Facility [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_CooperatieveRabobankUANewYorkBranchRevolvingLineofCreditMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Cooperatieve Rabobank U A New York Branch Revolving Lineof Credit [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_CooperatieveRabobankUANewYorkBranchRevolvingLineofCreditMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Cooperatieve Rabobank U.A., New York Branch Revolving Line of Credit [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanBenefitObligation_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel"> Benefit obligation at beginning of fiscal year </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanBenefitObligation_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Benefit obligation at end of fiscal year </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanBenefitObligation_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Benefit Obligation </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt Disclosure [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel"> Net (loss) income </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Net (loss) income </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Net Income (Loss) Attributable to Noncontrolling Interest, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Less: Net income attributable to noncontrolling interests </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Net Income (Loss) Attributable to Noncontrolling Interest </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_CostOfRealEstateSold_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Cost of real estate sold </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_CostOfRealEstateSold_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Cost Of Real Estate Sold </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_CostOfRealEstateSold_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Cost of real estate sold. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestatedFarmCreditFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Restated Farm Credit Facility [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestatedFarmCreditFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restated Farm Credit Facility [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestatedFarmCreditFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Restated farm credit facility [Member]. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PercentageOfFIFOInventory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Percentage of FIFO Inventory </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PercentageOfFIFOInventory_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Percentage of FIFO Inventory </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Share-based Compensation Arrangement by Share-based Payment Award [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Exercisable at September 30, 2022 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NonAllocatedExpenses_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Non-allocated expenses </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NonAllocatedExpenses_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Non Allocated Expenses </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NonAllocatedExpenses_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Non-allocated expenses. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LineOfCreditFacilityAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Lender Name </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LineOfCreditFacilityAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Lender Name [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SummaryOfIncomeTaxContingenciesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Summary of Income Tax Contingencies </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SummaryOfIncomeTaxContingenciesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Summary of Income Tax Contingencies [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisaggregationOfRevenueTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule of Disaggregates Revenue by Geographical Market and Product Type (Segment) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisaggregationOfRevenueTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Disaggregation of Revenue [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Stock options granted during period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Category of Item Purchased </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Category of Item Purchased [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherLiabilitiesNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Other long-term liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherLiabilitiesNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Liabilities, Noncurrent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Fiscal 2027 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Expected Future Benefit Payment, Year Five </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SummaryOfValuationAllowanceTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Summary of Valuation Allowance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SummaryOfValuationAllowanceTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Summary of Valuation Allowance [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestIncomeAndInterestExpenseDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Interest </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestIncomeAndInterestExpenseDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Interest Income and Interest Expense Disclosure [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeStatementLocationDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Income Statement Location </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeStatementLocationDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Income Statement Location [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Expired </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Fiscal 2023 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Long-Term Debt, Maturity, Year One </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel"> Reclassification adjustment of net (gain) loss on cash flow hedges included in earnings, Pre-Tax Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DebtInstrumentCreditSpreadAdjustmentPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Credit spread adjustment </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DebtInstrumentCreditSpreadAdjustmentPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt Instrument Credit Spread Adjustment Percentage </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DebtInstrumentCreditSpreadAdjustmentPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Debt instrument credit spread adjustment percentage. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetRetirementObligation_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Asset Retirement Obligation, Ending Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetRetirementObligation_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel"> Asset Retirement Obligation, Beginning Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetRetirementObligation_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Asset Retirement Obligation, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetRetirementObligation_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Asset Retirement Obligation </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetRetirementObligation_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Asset Retirement Obligation </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Property, Plant and Equipment [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_CommitmentsAndContingenciesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Commitments And Contingencies [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_CommitmentsAndContingenciesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Commitments And Contingencies [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_CommitmentsAndContingenciesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Commitments and contingencies. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_HealthCareCostsPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Health Insurance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_HealthCareCostsPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Health Care Costs, Policy [Policy Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel"> Shares/Units, Outstanding </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Shares/Units, Outstanding </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TerminatedMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Terminated [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TerminatedMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Terminated [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TerminatedMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Terminated. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DeferredMaintenanceCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Deferred maintenance costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DeferredMaintenanceCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Maintenance Costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DeferredMaintenanceCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Deferred maintenance costs. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Reductions due to settlement </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Long-term debt </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Long-Term Debt </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Line of credit facility, remaining borrowing capacity and cash and cash equivalents </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Line of Credit Facility, Remaining Borrowing Capacity </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InventoryDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Inventory Disclosure [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromRepaymentsOfCommercialPaper_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Proceeds from (Repayments of) Commercial Paper, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromRepaymentsOfCommercialPaper_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Changes in commercial paper, net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromRepaymentsOfCommercialPaper_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Proceeds from (Repayments of) Commercial Paper </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Consolidated other comprehensive (loss) income, Pre-Tax Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Comprehensive Income (Loss), before Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel"> Outstanding </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Outstanding </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SeniorNotesDueTwoThousandAndTwentySixMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Senior Notes due 2026 [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SeniorNotesDueTwoThousandAndTwentySixMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Senior Notes Due Two Thousand And Twenty Six [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SeniorNotesDueTwoThousandAndTwentySixMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Senior notes due two thousand and twenty six. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Debt Instrument, Name </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt Instrument, Name [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentFiscalYearFocus_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Document Fiscal Year Focus </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentFiscalYearFocus_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Document Fiscal Year Focus </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IntangibleAssetsNetExcludingGoodwill_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Intangible Assets, Net (Excluding Goodwill), Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IntangibleAssetsNetExcludingGoodwill_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Intangibles, net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IntangibleAssetsNetExcludingGoodwill_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Intangible Assets, Net (Excluding Goodwill) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_MovementInDeferredTaxAssetValuationAllowanceLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Movement in Deferred Tax Asset Valuation Allowance [Roll Forward] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_MovementInDeferredTaxAssetValuationAllowanceLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Movement In Deferred Tax Asset Valuation Allowance [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_MovementInDeferredTaxAssetValuationAllowanceLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Movement in deferred tax asset valuation allowance. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RepaymentsOfDebt_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Repayments of debt </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RepaymentsOfDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Repayments of Debt </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ExtinguishmentOfDebtAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Termination of credit facility </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ExtinguishmentOfDebtAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Extinguishment of Debt, Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RansomwareIncidentTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Ransomware Incident </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RansomwareIncidentTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Ransomware Incident [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RansomwareIncidentTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Ransomware Incident related disclosure. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LoansAndLeasesReceivableCollateralForSecuredBorrowing_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Loans and Leases Receivable, Collateral for Secured Borrowings </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LoansAndLeasesReceivableCollateralForSecuredBorrowing_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Loans And Leases Receivable Collateral For Secured Borrowing </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LoansAndLeasesReceivableCollateralForSecuredBorrowing_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Loans and leases receivable collateral for secured borrowing </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Operating Leases, Fiscal 2024 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Lessee, Operating Lease, Liability, to be Paid, Year Two </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Earnings Per Share, Basic, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Basic earnings (loss) per share attributable to common stockholders </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Earnings Per Share, Basic </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TransferOfFinancialAssetsAccountedForAsSalesCashProceedsReceivedForAssetsDerecognizedAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Receivables sold under accounts receivable sales agreement </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TransferOfFinancialAssetsAccountedForAsSalesCashProceedsReceivedForAssetsDerecognizedAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Transfer of Financial Assets Accounted for as Sales, Cash Proceeds Received for Assets Derecognized, Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockTargetAwards2016Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Restricted Stock, Target Awards, 2016 [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockTargetAwards2016Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restricted Stock Target Awards2016 [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockTargetAwards2016Member_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Restricted stock target awards 2016. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ShippingAndHandlingCostsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Shipping and Handling Cost </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ShippingAndHandlingCostsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Shipping And Handling Costs Policy [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ShippingAndHandlingCostsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Shipping and handling costs. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_BadDebtExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Bad debt expense </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_BadDebtExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Bad Debt Expense </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_BadDebtExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Bad debt expense. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InventoryLIFOReserve_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> LIFO reserve </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InventoryLIFOReserve_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Inventory, LIFO Reserve </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestructuringAndOtherCostsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restructuring And Other Costs [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestructuringAndOtherCostsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Restructuring and other costs. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DividendsCommonStockCash_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Dividends declared (per share - $1.00, $0.88 and $1.33) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DividendsCommonStockCash_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Dividends, Common Stock, Cash </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GoodwillGross_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel"> Goodwill, Gross beginning of fiscal year </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GoodwillGross_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Goodwill, Gross end of fiscal year </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GoodwillGross_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Goodwill, Gross </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> ASSETS </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Assets [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInAccruedLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Increase (Decrease) in Accrued Liabilities, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInAccruedLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Accrued liabilities and other </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInAccruedLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Increase (Decrease) in Accrued Liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_IncrementalAmountOfLineOfCredit_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Incremental line of credit </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_IncrementalAmountOfLineOfCredit_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Incremental Amount Of Line Of Credit </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_IncrementalAmountOfLineOfCredit_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Incremental amount of line of credit. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_FinanceLeasePropertyPlantAndEquipmentNet_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Property, plant and equipment, net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_FinanceLeasePropertyPlantAndEquipmentNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Finance Lease Property Plant And Equipment Net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_FinanceLeasePropertyPlantAndEquipmentNet_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Finance lease property, plant and equipment, net. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SegmentReportingInformationPercentageOfNetSalesToUnaffiliatedCustomers_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Percentage of Net Sales to Unaffiliated Customers </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SegmentReportingInformationPercentageOfNetSalesToUnaffiliatedCustomers_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Segment Reporting Information Percentage Of Net Sales To Unaffiliated Customers </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SegmentReportingInformationPercentageOfNetSalesToUnaffiliatedCustomers_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Segment reporting information, percentage of net sales to unaffiliated customers. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GrossProfit_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Gross profit </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GrossProfit_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Gross Profit </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfDebtInstrumentsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule of Carrying Value and Weighted Average Interest Rate of Individual Components of Debt </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfDebtInstrumentsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Long-Term Debt Instruments [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_HurricaneMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Hurricane Michael [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_HurricaneMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Hurricane [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentFaceAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Debt instrument, aggregate principal amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentFaceAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt Instrument, Face Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostWeightedAverageInterestCreditingRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Interest crediting rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostWeightedAverageInterestCreditingRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Weighted-Average Interest Crediting Rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmountByMoreThanTenPercent_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Reporting unit percentage of fair value in excess of carrying amount. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmountByMoreThanTenPercent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Reporting unit, percentage of fair value in excess of carrying value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmountByMoreThanTenPercent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Reporting Unit Percentage Of Fair Value In Excess Of Carrying Amount By More Than Ten Percent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NaturalGasCommodityHedgeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Natural Gas Commodity Hedge [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NaturalGasCommodityHedgeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Natural Gas Commodity Hedge [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NaturalGasCommodityHedgeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Natural gas commodity hedge. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DelayedDrawTermFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Delayed Draw Term Facility [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DelayedDrawTermFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Delayed Draw Term Facility [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DelayedDrawTermFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Delayed draw term facility. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestIncomeExpenseNonoperatingNet_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Interest expense, net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestIncomeExpenseNonoperatingNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Interest expense, net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestIncomeExpenseNonoperatingNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Interest Income (Expense), Nonoperating, Net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancialInstrumentAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Financial Instrument [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentByTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Long-Lived Tangible Asset </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentByTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Long-Lived Tangible Asset [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Percentage of remaining interest acquired </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Percentage of remaining interest acquired </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Business Acquisition, Percentage of Voting Interests Acquired </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule Of Restructuring And Related Costs [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Restructuring and Related Costs [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ReportingUnitDiscountRate_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Reporting unit, discount rate. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ReportingUnitDiscountRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Reporting unit, discount rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ReportingUnitDiscountRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Reporting Unit Discount Rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SeniorNotesDueTwoThousandAndTwentySevenMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Senior Notes due 2027 [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SeniorNotesDueTwoThousandAndTwentySevenMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Senior Notes Due Two Thousand And Twenty Seven [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SeniorNotesDueTwoThousandAndTwentySevenMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Senior notes due two thousand and twenty seven. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Debt, Current, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Less: current portion of debt </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Current portion of debt </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt, Current </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Debt [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesAndStockholdersEquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> LIABILITIES AND EQUITY </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesAndStockholdersEquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Liabilities and Equity [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Catastrophic Event </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Catastrophic Event [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxesPaidNet_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Income Taxes Paid, Net, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxesPaidNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Income taxes, cash paid net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxesPaidNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Income Taxes Paid, Net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_Pensionandotherpostretirementplansassets_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Pension and other postretirement plans, assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_Pensionandotherpostretirementplansassets_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Pensionandotherpostretirementplansassets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_Pensionandotherpostretirementplansassets_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Pension and other postretirement plans, assets. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_BrazilianNetWorthDeduction_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Brazilian net worth deduction </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_BrazilianNetWorthDeduction_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Brazilian Net Worth Deduction </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_BrazilianNetWorthDeduction_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Brazilian net worth deduction. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Property, Plant and Equipment </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Property, Plant and Equipment, Policy [Policy Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NotesReceivableGross_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Carrying amount of accounts receivable collateralizing maximum available borrowings </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NotesReceivableGross_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Financing Receivable, before Allowance for Credit Loss </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NotesReceivableGross_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Financing Receivable, before Allowance for Credit Loss, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetirementPlanTaxStatusDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Retirement Plan Tax Status </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetirementPlanTaxStatusDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Retirement Plan Tax Status [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxAuthorityAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Income Tax Authority </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxAuthorityAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Income Tax Authority [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TypeOfRestructuringDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Type of Restructuring </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TypeOfRestructuringDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Type of Restructuring [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProfitLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Consolidated net income (loss) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProfitLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Consolidated net income (loss) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProfitLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Net Income (Loss), Including Portion Attributable to Noncontrolling Interest </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DefinedBenefitPlanFairValueofPlanAssetsExcludingNetAssetValueInvestments_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Defined Benefit Plan, Fair Value of Plan Assets, Excluding Net Asset Value Investments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DefinedBenefitPlanFairValueofPlanAssetsExcludingNetAssetValueInvestments_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan Fair Valueof Plan Assets Excluding Net Asset Value Investments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DefinedBenefitPlanFairValueofPlanAssetsExcludingNetAssetValueInvestments_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Defined benefit plan, fair value of plan assets, excluding net asset value investments. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_EffectiveIncomeTaxRateReconciliationAdjustmentAndResolutionOfFederalStateAndForeignTaxUncertainties_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Adjustment and resolution of federal, state and foreign tax uncertainties </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_EffectiveIncomeTaxRateReconciliationAdjustmentAndResolutionOfFederalStateAndForeignTaxUncertainties_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Effective Income Tax Rate Reconciliation Adjustment And Resolution Of Federal State And Foreign Tax Uncertainties </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_EffectiveIncomeTaxRateReconciliationAdjustmentAndResolutionOfFederalStateAndForeignTaxUncertainties_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Effective income tax rate reconciliation, adjustment and resolution of federal, state and foreign tax uncertainties. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsCurrentAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Current assets: </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsCurrentAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Assets, Current [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Fiscal 2026 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Finite-Lived Intangible Asset, Expected Amortization, Year Four </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Other comprehensive (loss) income before reclassifications </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Comprehensive Income (Loss), before Reclassifications, Net of Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OperatingAndFinanceLeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Present value of future lease payments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OperatingAndFinanceLeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating And Finance Lease Liability </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OperatingAndFinanceLeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Present value of lessee's discounted obligation for lease payments from operating and finance lease. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Fiscal 2024 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Finite-Lived Intangible Asset, Expected Amortization, Year Two </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_IncomeTaxesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Income Taxes [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_IncomeTaxesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Income Taxes [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ScheduleOfRestructuringAndOtherCostsReserveByTypeOfCostTextBlockTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule of Changes in Restructuring Accrual and Reconciliation of Accrual Charges </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ScheduleOfRestructuringAndOtherCostsReserveByTypeOfCostTextBlockTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule Of Restructuring And Other Costs Reserve By Type Of Cost Text Block Table [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ScheduleOfRestructuringAndOtherCostsReserveByTypeOfCostTextBlockTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Schedule of restructuring and other costs reserve by type of cost. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentReportingDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Segment Information </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentReportingDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Segment Reporting Disclosure [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueFromRelatedParties_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Net sales to affiliated companies </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueFromRelatedParties_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Revenue from Related Parties </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAmountsRecognizedInOtherComprehensiveIncomeLossTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule of Amounts Recognized in Other Comprehensive Loss (Income) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAmountsRecognizedInOtherComprehensiveIncomeLossTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_CommitmentsAndContingenciesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Commitments And Contingencies [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_CommitmentsAndContingenciesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Commitments and contingencies. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule of Deferred Tax Assets and Liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Deferred Tax Assets and Liabilities [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_FairValueofDebtStepUpDeferredFinancingCostsandUnamortizedBondDiscounts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Fair value of debt step-up, deferred financing costs and unamortized bond discounts </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_FairValueofDebtStepUpDeferredFinancingCostsandUnamortizedBondDiscounts_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Fair Valueof Debt Step Up Deferred Financing Costsand Unamortized Bond Discounts </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_FairValueofDebtStepUpDeferredFinancingCostsandUnamortizedBondDiscounts_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Fair value of debt step-up, deferred financing costs and unamortized bond discounts. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Prior service cost arising during the period, Pre-Tax Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Prior service cost (credit) arising during period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfGoodwillTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Changes in Carrying Amount of Goodwill </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfGoodwillTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Goodwill [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TechnologyAndPatentsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Technology and Patents [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TechnologyAndPatentsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Technology And Patents [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TechnologyAndPatentsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Technology and Patents [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueMeasurementsFairValueHierarchyDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Fair Value Hierarchy and NAV </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueMeasurementsFairValueHierarchyDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Fair Value Hierarchy and NAV [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LoansReceivableDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Loans Receivable </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LoansReceivableDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Loans Receivable [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_LoansReceivableDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> [Domain] for Loans Receivable [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Additions for tax positions taken in prior fiscal years </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_CashSurrenderValueIncreaseInExcessOfPremiumPaid_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Cash surrender value increase in excess of premiums paid </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_CashSurrenderValueIncreaseInExcessOfPremiumPaid_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Cash Surrender Value Increase In Excess Of Premium Paid </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_CashSurrenderValueIncreaseInExcessOfPremiumPaid_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Cash surrender value increase in excess of premium paid. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Deferred loss on cash flow hedges, Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="country_MX_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Mexico [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="country_MX_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> MEXICO </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RepaymentsOfUnsecuredDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Repayments of debt </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RepaymentsOfUnsecuredDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Repayments of Unsecured Debt </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueMeasurementFrequencyDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Measurement Frequency </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueMeasurementFrequencyDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Measurement Frequency [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_GuarantorObligationsEstimatedExposureUndiscounted_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Guarantor Obligations, Estimated Exposure, Undiscounted </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_GuarantorObligationsEstimatedExposureUndiscounted_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Guarantor Obligations Estimated Exposure Undiscounted </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_GuarantorObligationsEstimatedExposureUndiscounted_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Guarantor obligations, estimated exposure, undiscounted. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NonqualifiedPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Non-Qualified Plans [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NonqualifiedPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Nonqualified Plan [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Change in operating assets and liabilities, net of acquisitions and divestitures: </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Increase (Decrease) in Operating Capital [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestructuringAndOtherCostsNoncash_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Restructuring and other costs, noncash </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestructuringAndOtherCostsNoncash_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restructuring And Other Costs Noncash </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestructuringAndOtherCostsNoncash_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Restructuring and Other Costs, Noncash </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Health care cost trend rate assumed for next year </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RetirementPlansAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Retirement Plans [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RetirementPlansAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Retirement Plans [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ClaimedTaxDeficiencyIncludingPenaltiesAndInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Claimed tax deficiency including penalties and interest </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ClaimedTaxDeficiencyIncludingPenaltiesAndInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Claimed Tax Deficiency Including Penalties And Interest </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ClaimedTaxDeficiencyIncludingPenaltiesAndInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Claimed tax deficiency including penalties and interest. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FIFOInventoryAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Inventories at FIFO cost </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FIFOInventoryAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> FIFO Inventory Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtLongtermAndShorttermCombinedAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Total debt </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtLongtermAndShorttermCombinedAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt, Long-Term and Short-Term, Combined Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyTransactionLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Related Party Transaction [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyTransactionLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Related Party Transaction [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LeaseCostAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Lease, Cost [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AllowanceForCreditLossMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Allowance for Doubtful Accounts [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AllowanceForCreditLossMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> SEC Schedule, 12-09, Allowance, Credit Loss [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SeniorNotesDueOnJuneTwoThousandAndThirtyThreeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Senior Notes due June 2033 [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SeniorNotesDueOnJuneTwoThousandAndThirtyThreeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Senior Notes Due On June Two Thousand And Thirty Three [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SeniorNotesDueOnJuneTwoThousandAndThirtyThreeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Senior Notes due June 2033. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TenderedAndExchangedNotesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Tendered and Exchanged Notes [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TenderedAndExchangedNotesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Tendered And Exchanged Notes [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_TenderedAndExchangedNotesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Tendered and exchanged notes. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> United States </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Income (Loss) from Continuing Operations before Income Taxes, Domestic </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DescriptionOfBusinessAndSummaryOfSignificantAccountingPoliciesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Description Of Business And Summary Of Significant Accounting Policies [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DescriptionOfBusinessAndSummaryOfSignificantAccountingPoliciesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Description of Business and Summary of Significant Accounting Policies [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanContributionsByEmployer_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Employer contributions </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanContributionsByEmployer_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Plan Assets, Contributions by Employer </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CoverAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Cover [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockForAnnualBonusMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Restricted Stock For Annual Bonus [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockForAnnualBonusMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restricted Stock For Annual Bonus [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockForAnnualBonusMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Restricted stock for annual bonus. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetirementPlanSponsorLocationAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Retirement Plan Sponsor Location </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetirementPlanSponsorLocationAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Retirement Plan Sponsor Location [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsAccumulatedBenefitObligation_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Defined benefit plan, pension plan with accumulated benefit obligation in excess of plan assets, accumulated benefit obligation </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsAccumulatedBenefitObligation_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DerivativeOtherAssetsCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Derivative other assets current </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DerivativeOtherAssetsCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Derivative Other Assets Current </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DerivativeOtherAssetsCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Derivative other assets current. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Operating Leases, Fiscal 2027 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Lessee, Operating Lease, Liability, to be Paid, Year Five </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Vested and released </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Shares/Units, Vested and released </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NumberOfAdditionalDemandLetters_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Number of additional demand letters </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NumberOfAdditionalDemandLetters_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Number Of Additional Demand Letters </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NumberOfAdditionalDemandLetters_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Number of additional demand letters. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ForeignCurrencyTransactionGainLossRealized_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Foreign Currency Transaction Gain (Loss), after Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ForeignCurrencyTransactionGainLossRealized_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Foreign Currency Transaction Gain (Loss), Realized </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_AmortizationOfOtherIntangibleAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Other Intangible Assets Amortization Expense </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_AmortizationOfOtherIntangibleAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Amortization Of Other Intangible Assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_AmortizationOfOtherIntangibleAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Amortization of other intangible assets. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestructuringAndOtherCostsReserveForeignCurrencyRateChangesAndOther_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Foreign currency rate changes and other </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestructuringAndOtherCostsReserveForeignCurrencyRateChangesAndOther_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restructuring And Other Costs Reserve Foreign Currency Rate Changes And Other </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestructuringAndOtherCostsReserveForeignCurrencyRateChangesAndOther_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Restructuring and other costs reserve foreign currency rate changes and other. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GoodwillImpairmentLoss_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Goodwill impairment </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GoodwillImpairmentLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Goodwill impairment loss </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GoodwillImpairmentLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Goodwill impairment </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GoodwillImpairmentLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Goodwill, Impairment Loss </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Other comprehensive (loss) income attributable to common stockholders, Pre-Tax Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ForeignPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Foreign Plan [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ForeignPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Foreign Plan [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_WeightedAverageInterestRateExcludingFairValueStepUp_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Weighted average interest rate excluding fair value step-up </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_WeightedAverageInterestRateExcludingFairValueStepUp_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Weighted Average Interest Rate Excluding Fair Value Step Up </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_WeightedAverageInterestRateExcludingFairValueStepUp_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Weighted Average Interest Rate Excluding Fair Value Step-Up </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_MultiemployerPlansWithdrawalObligationAccumulatedFundingDeficiency_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Withdrawal obligation accumulated funding deficiency </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_MultiemployerPlansWithdrawalObligationAccumulatedFundingDeficiency_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Multiemployer Plans Withdrawal Obligation Accumulated Funding Deficiency </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_MultiemployerPlansWithdrawalObligationAccumulatedFundingDeficiency_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Multiemployer plans withdrawal obligation accumulated funding deficiency. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesCurrentAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Current liabilities: </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesCurrentAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Liabilities, Current [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NoncompeteAgreementsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Noncompete Agreements [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NoncompeteAgreementsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Noncompete Agreements [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MaximumMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Maximum [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MaximumMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Maximum [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MaximumMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Maximum [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Summary of Assets Measured at Fair Value Based on NAV Per Share </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Defined Benefit Plans Disclosures [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NumberOfCorrugatedPackagingPlants_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Number of corrugated packaging plants </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NumberOfCorrugatedPackagingPlants_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Number of Corrugated Packaging Plants </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NumberOfCorrugatedPackagingPlants_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Number of corrugated packaging plants. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SterlingOvernightIndexAverageMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> SONIA Loans [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SterlingOvernightIndexAverageMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Sterling Overnight Index Average [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SterlingOvernightIndexAverageMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Sterling overnight index average [Member]. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LineOfCreditFacilityDateOfFirstRequiredPayment1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Credit facility semiannual installments repayment beginning date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LineOfCreditFacilityDateOfFirstRequiredPayment1_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Line of Credit Facility, Date of First Required Payment </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherPensionPlansPostretirementOrSupplementalPlansDefinedBenefitMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Other Pension, Postretirement and Supplemental Plans [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherPensionPlansPostretirementOrSupplementalPlansDefinedBenefitMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Pension, Postretirement and Supplemental Plans [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetirementPlanNameAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Retirement Plan Name </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetirementPlanNameAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Retirement Plan Name [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Net cash used for investing activities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Net Cash Provided by (Used in) Investing Activities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CostsAssociatedWithExitOrDisposalActivitiesOrRestructuringsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Restructuring and Other Costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CostsAssociatedWithExitOrDisposalActivitiesOrRestructuringsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Costs Associated with Exit or Disposal Activities or Restructurings, Policy [Policy Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Exercised </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ForestLandsAndMineralRightsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Forestlands and Mineral Rights [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ForestLandsAndMineralRightsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Forest Lands And Mineral Rights [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ForestLandsAndMineralRightsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Forestlands and mineral rights. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_MovementInDeferredTaxAssetValuationAllowanceRollForwardTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Movement In Deferred Tax Asset Valuation Allowance Roll Forward [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_MovementInDeferredTaxAssetValuationAllowanceRollForwardTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Movement In Deferred Tax Asset Valuation Allowance Roll Forward [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_MovementInDeferredTaxAssetValuationAllowanceRollForwardTable_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Movement in deferred tax asset valuation allowance roll forward. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_MovementInDeferredTaxAssetValuationAllowanceRollForwardAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Movement In Deferred Tax Asset Valuation Allowance Roll Forward [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_MovementInDeferredTaxAssetValuationAllowanceRollForwardAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Movement in deferred tax asset valuation allowance roll forward. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfInventoryCurrentTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule of Inventories </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfInventoryCurrentTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Inventory, Current [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Accumulated Defined Benefit Plans Adjustment [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UseOfEstimates_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Use of Estimates </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UseOfEstimates_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Use of Estimates, Policy [Policy Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Applicable margin </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt Instrument, Basis Spread on Variable Rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredIncomeTaxLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Deferred Tax Liabilities, Gross </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredIncomeTaxLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax Liabilities, Gross </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Less: Other comprehensive income (loss) attributable to noncontrolling interests, Net of Tax Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_CondensedConsolidatedStatementsOfCashFlowsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Condensed Consolidated Statements Of Cash Flows [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_CondensedConsolidatedStatementsOfCashFlowsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Condensed Consolidated Statements of Cash Flows [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Fiscal 2027 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Finite-Lived Intangible Asset, Expected Amortization, Year Five </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictiononExclusionofEligibleReceivablesofSpecificObligorsAggregateMaximumPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Restriction on Exclusion of Eligible Receivables of Specific Obligors, Aggregate Maximum Percentage </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictiononExclusionofEligibleReceivablesofSpecificObligorsAggregateMaximumPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restrictionon Exclusionof Eligible Receivablesof Specific Obligors Aggregate Maximum Percentage </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictiononExclusionofEligibleReceivablesofSpecificObligorsAggregateMaximumPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Restriction on Exclusion of Eligible Receivables of Specific Obligors, Aggregate Maximum Percentage </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetRetirementObligationsPolicy_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Asset Retirement Obligations </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetRetirementObligationsPolicy_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Asset Retirement Obligation [Policy Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestructuringAndOtherCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Restructuring and other costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestructuringAndOtherCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restructuring And Other Costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestructuringAndOtherCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Amount charged against earnings in the period for incurred and estimated costs, excluding asset retirement obligations, associated with exit from or disposal of business activities or restructurings pursuant to a program that is planned and controlled by management, and materially changes either the scope of a business undertaken by an entity, or the manner in which that business is conducted and other costs including but not limited to asset impairments, acquisition and integration costs. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentUsefulLife_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Property, Plant and Equipment, Useful Life </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentUsefulLife_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Property, Plant and Equipment, Useful Life </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedContributionPlanCostRecognized_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Defined Contribution Plan, Cost </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedContributionPlanCostRecognized_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Contribution Plan, Cost </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ForeignCountryMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Foreign Country [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ForeignCountryMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Foreign Tax Authority [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PreTaxImpactOfLostSalesAndOperationalDisruption_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Pre-tax impact of lost sales and operational disruption. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PreTaxImpactOfLostSalesAndOperationalDisruption_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Pre-tax impact of lost sales and operational disruption </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_PreTaxImpactOfLostSalesAndOperationalDisruption_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Pre Tax Impact Of Lost Sales And Operational Disruption </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Security Owned and Sold, Not yet Purchased Fair Value, Security Name </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Security Owned and Sold, Not yet Purchased Fair Value, Security Name [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Fiscal 2025 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Finite-Lived Intangible Asset, Expected Amortization, Year Three </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Common Stock, Shares Authorized </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Common Stock, Shares Authorized </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShortTermDebtTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Short-term Debt, Type </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShortTermDebtTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Short-Term Debt, Type [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanUltimateHealthCareCostTrendRate1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanUltimateHealthCareCostTrendRate1_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Ultimate Health Care Cost Trend Rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_Percentageofourmillassetsasmeasuredatcostwithalifeof25yearsorless_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Percentage of our mill assets as measured at cost with a life of 25 years or less </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_Percentageofourmillassetsasmeasuredatcostwithalifeof25yearsorless_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Percentageofourmillassetsasmeasuredatcostwithalifeof25yearsorless </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_Percentageofourmillassetsasmeasuredatcostwithalifeof25yearsorless_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Percentage of our mill assets as measured at cost with a life of 25 years or less </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MaintenanceCostPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Repair and Maintenance Costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MaintenanceCostPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Maintenance Cost, Policy [Policy Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Settlement loss (gain) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_TradingSymbol_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Trading Symbol </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_TradingSymbol_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Trading Symbol </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DefinedContributionPlanEmployerContributiononBasicSalaryAutomaticMatchingContribution_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Defined Contribution Plan Employer Contribution on Basic Salary, Automatic Matching Contribution </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DefinedContributionPlanEmployerContributiononBasicSalaryAutomaticMatchingContribution_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Contribution Plan Employer Contributionon Basic Salary Automatic Matching Contribution </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DefinedContributionPlanEmployerContributiononBasicSalaryAutomaticMatchingContribution_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Defined contribution plan employer contribution on basic salary, automatic matching contribution. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquitySecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Equity Securities [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquitySecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Equity Securities [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SharebasedCompensationArrangementbySharebasedPaymentAwardStockAppreciationRightsExercisesinPeriodIntrinsicValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Share-based Compensation Arrangement by Share-based Payment Award, Stock Appreciation Rights, Exercises in Period, Intrinsic Value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SharebasedCompensationArrangementbySharebasedPaymentAwardStockAppreciationRightsExercisesinPeriodIntrinsicValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Sharebased Compensation Arrangementby Sharebased Payment Award Stock Appreciation Rights Exercisesin Period Intrinsic Value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SharebasedCompensationArrangementbySharebasedPaymentAwardStockAppreciationRightsExercisesinPeriodIntrinsicValue_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Share-based Compensation Arrangement by Share-based Payment Award, Stock Appreciation Rights, Exercises in Period, Intrinsic Value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Distributed and undistributed (loss) income available to common stockholders, Diluted </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Net Income (Loss) Available to Common Stockholders, Diluted </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_WeightedAverageRemainingLeaseTermAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Weighted average remaining lease term: </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_WeightedAverageRemainingLeaseTermAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Weighted Average Remaining Lease Term [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_WeightedAverageRemainingLeaseTermAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Weighted average remaining lease term. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Summary of Reclassification out of Accumulated Other Comprehensive Loss </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_InterestIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Interest income </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_InterestIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Interest Income </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_InterestIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Interest income. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Accumulated Net Gain (Loss) from Designated or Quality Cash Flow Hedges [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ReversalOfOtherAdjustments_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Other adjustments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ReversalOfOtherAdjustments_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Reversal Of Other Adjustments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_ReversalOfOtherAdjustments_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Reversal of adjustments in Adjusted EBITDA. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NotesDueFiscal2023To2028Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Notes Due Fiscal 2023 to 2028 [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NotesDueFiscal2023To2028Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Notes Due Fiscal2023 To2028 [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_NotesDueFiscal2023To2028Member_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Notes due fiscal 2023 to 2028. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_AuthorizedShareRepurchaseAsAPercentageOfCommonStockOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Authorized share repurchase as a percentage of common stock outstanding </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_AuthorizedShareRepurchaseAsAPercentageOfCommonStockOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Authorized Share Repurchase As A Percentage Of Common Stock Outstanding </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_AuthorizedShareRepurchaseAsAPercentageOfCommonStockOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Authorized share repurchase as a percentage of common stock outstanding. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ParentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Parent [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ParentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Parent [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OperatingAndFinanceLeaseLiabilityPaymentsDueYearFive_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Fiscal 2027 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OperatingAndFinanceLeaseLiabilityPaymentsDueYearFive_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating And Finance Lease Liability Payments Due Year Five </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OperatingAndFinanceLeaseLiabilityPaymentsDueYearFive_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Amount of lessee's undiscounted obligation for lease payments for operating and finance lease, due in fifth fiscal year following latest fiscal year. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Subsequent Event Type [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsOther_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Other </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsOther_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax Assets, Other </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DeferredTaxLiabilityDeferredGain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Deferred gain </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DeferredTaxLiabilityDeferredGain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax Liability Deferred Gain </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_DeferredTaxLiabilityDeferredGain_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Deferred tax liability, deferred gain. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_AccumulatedOtherComprehensiveIncomeLossTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule of Changes in Accumulated Other Comprehensive Loss, Net of Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_AccumulatedOtherComprehensiveIncomeLossTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Accumulated Other Comprehensive Income Loss Table [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_AccumulatedOtherComprehensiveIncomeLossTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Accumulated other comprehensive income (loss). </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_IncreaseInCostOfGoodsSoldAndLIFOReserveDueToInflation_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Increase in cost of goods sold and LIFO reserve due to inflation </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_IncreaseInCostOfGoodsSoldAndLIFOReserveDueToInflation_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Increase In Cost Of Goods Sold And L I F O Reserve Due To Inflation </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_IncreaseInCostOfGoodsSoldAndLIFOReserveDueToInflation_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Increase in cost of goods sold and LIFO reserve due to inflation. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BalanceSheetLocationAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Balance Sheet Location </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BalanceSheetLocationAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Balance Sheet Location [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OperatingAndFinanceLeaseLiabilityPaymentsDueYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Fiscal 2026 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OperatingAndFinanceLeaseLiabilityPaymentsDueYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating And Finance Lease Liability Payments Due Year Four </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OperatingAndFinanceLeaseLiabilityPaymentsDueYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Amount of lessee's undiscounted obligation for lease payments for operating and finance lease, due in fourth fiscal year following latest fiscal year. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Net actuarial (gain) loss </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ComprehensiveIncomeNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Comprehensive income (loss) attributable to common stockholders </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ComprehensiveIncomeNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Comprehensive Income (Loss), Net of Tax, Attributable to Parent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SeniorNotesDueTwoThousandAndTwentyEightMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Senior Notes due 2028 [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SeniorNotesDueTwoThousandAndTwentyEightMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Senior Notes Due Two Thousand And Twenty Eight [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_SeniorNotesDueTwoThousandAndTwentyEightMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Senior notes due two thousand and twenty eight. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TangibleAssetImpairmentCharges_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Pre-tax non-cash impairment </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TangibleAssetImpairmentCharges_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel"> Mineral rights impairment </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TangibleAssetImpairmentCharges_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Mineral rights impairment </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TangibleAssetImpairmentCharges_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Tangible Asset Impairment Charges, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TangibleAssetImpairmentCharges_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Land and Development impairments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TangibleAssetImpairmentCharges_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Land and Development impairments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestCostsCapitalized_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Interest costs, capitalized during period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestCostsCapitalized_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Interest Costs Capitalized </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_LatinAmericaMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Latin America </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_LatinAmericaMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Latin America [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Risk-free rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Risk-free interest rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Proceeds from Sale of Property, Plant, and Equipment, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Proceeds from sale of property, plant and equipment </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Proceeds from Sale of Property, Plant, and Equipment </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountsPayableCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Accounts Payable, Current, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountsPayableCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Accounts payable </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountsPayableCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Accounts Payable, Current </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInOtherOperatingAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Increase (Decrease) in Other Operating Assets, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInOtherOperatingAssets_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Other assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInOtherOperatingAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Increase (Decrease) in Other Operating Assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_CostofOurMillMachineryandEquipmentwithaLifeof25YearsorLessMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Cost of Our Mill Machinery and Equipment with a Life of 25 Years or Less </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_CostofOurMillMachineryandEquipmentwithaLifeof25YearsorLessMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Costof Our Mill Machineryand Equipmentwitha Lifeof25 Yearsor Less [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_CostofOurMillMachineryandEquipmentwithaLifeof25YearsorLessMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Cost of Our Mill Machinery and Equipment with a Life of 25 Years or Less </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DomesticPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Domestic Plan [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DomesticPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Domestic Plan [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Accumulated Other Comprehensive Income (Loss) [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Accumulated Other Comprehensive Income (Loss) [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule Of Related Party Transactions By Related Party [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Related Party Transactions, by Related Party [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashFlowHedgingMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Cash Flow Hedging [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TreasuryStockSharesAcquired_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Purchases of common stock </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TreasuryStockSharesAcquired_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Treasury stock, shares, acquired </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TreasuryStockSharesAcquired_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Purchases of common stock </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TreasuryStockSharesAcquired_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Treasury Stock, Shares, Acquired </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockTargetAwardsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Restricted Stock, Target Awards [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockTargetAwardsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restricted Stock Target Awards [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_RestrictedStockTargetAwardsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Restricted Stock, Target Awards [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OtherComingledFundsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Other [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OtherComingledFundsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Comingled Funds [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_OtherComingledFundsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Other comingled funds. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Long-Lived Tangible Asset </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Long-Lived Tangible Asset [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Debt instrument, maturity period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt Instrument, Term </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Disposal Group, Including Discontinued Operation, Assets, Current, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Assets held for sale </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Disposal Group, Including Discontinued Operation, Assets, Current </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestructuringAndRelatedCostIncurredCost_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Restructuring and Related Cost, Incurred Cost </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestructuringAndRelatedCostIncurredCost_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Restructuring </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestructuringAndRelatedCostIncurredCost_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restructuring and Related Cost, Incurred Cost </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockParOrStatedValuePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Common Stock, Par or Stated Value Per Share </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockParOrStatedValuePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Common Stock, Par or Stated Value Per Share </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityWellKnownSeasonedIssuer_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Entity Well-known Seasoned Issuer </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityWellKnownSeasonedIssuer_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Entity Well-known Seasoned Issuer </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel"> Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel"> Reclassification adjustment of net (gain) loss on cash flow hedges included in earnings, Net of Tax Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Reclassification adjustment of net loss (gain) on cash flow hedges included in earnings </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Equity Method Investment, Difference Between Carrying Amount and Underlying Equity </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Equity Method Investment, Difference Between Carrying Amount and Underlying Equity </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Summary of Restricted Stock Awards - Vested and Released, Granted and Changes </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_AdjustedEarningsBeforeInterestTaxDepreciationAndAmortization_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Adjusted EBITDA </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_AdjustedEarningsBeforeInterestTaxDepreciationAndAmortization_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Adjusted Earnings Before Interest, Tax, Depreciation And Amortization </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="wrk_AdjustedEarningsBeforeInterestTaxDepreciationAndAmortization_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Adjusted earnings before interest, tax, depreciation and Amortization </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Shares/Units, Granted </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Granted </link:label>
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<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Postretirement benefit liabilities, net of current portion </link:label>
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1 Subsequent Filing that References this Filing

  As Of               Filer                 Filing    For·On·As Docs:Size             Issuer                      Filing Agent

11/17/23  WestRock Co.                      10-K        9/30/23  166:41M                                    Donnelley … Solutions/FA

31 Previous Filings that this Filing References

  As Of               Filer                 Filing    For·On·As Docs:Size             Issuer                      Filing Agent

11/02/22  WestRock Co.                      8-K:5,9    10/27/22   11:375K                                   Business Wire/FA
10/06/22  WestRock Co.                      8-K:5,9     9/30/22   11:238K                                   Business Wire/FA
 8/24/22  WestRock Co.                      8-K:8,9     8/18/22   11:1.8M                                   Business Wire/FA
 7/11/22  WestRock Co.                      8-K:1,2,9   7/07/22   13:3.9M                                   Business Wire/FA
 3/11/22  WestRock Co.                      8-K:5,9     3/09/22   11:256K                                   Business Wire/FA
12/13/21  WestRock Co.                      DEF 14A     1/28/22    1:1.4M                                   Donnelley … Solutions/FA
 5/07/21  WestRock Co.                      10-Q        3/31/21   82:19M                                    ActiveDisclosure/FA
 2/05/21  WestRock Co.                      10-Q       12/31/20   83:12M                                    ActiveDisclosure/FA
11/23/20  WestRock Co.                      10-K        9/30/20  155:54M                                    ActiveDisclosure/FA
 6/03/20  WestRock Co.                      8-K:1,2,8,9 6/03/20   15:867K                                   Donnelley … Solutions/FA
11/18/19  WestRock Co.                      10-K        9/30/19  160:56M                                    Donnelley … Solutions/FA
 8/02/19  WestRock Co.                      10-Q        6/30/19   97:35M                                    ActiveDisclosure/FA
 5/20/19  WestRock Co.                      8-K:1,2,8,9 5/16/19    6:685K                                   Donnelley … Solutions/FA
 5/03/19  WestRock Co.                      10-Q        3/31/19   97:31M                                    ActiveDisclosure/FA
12/10/18  WestRock Co.                      8-K:1,2,9  12/07/18    2:207K                                   Globenewswire Inc./FA
12/03/18  WestRock Co.                      8-K:1,2,9  12/03/18    4:753K                                   Globenewswire Inc./FA
11/16/18  WestRock Co.                      10-K        9/30/18  148:33M                                    ActiveDisclosure/FA
11/05/18  WestRock Co.                      8-K:1,2,3,511/02/18   14:507K                                   Globenewswire Inc./FA
 3/06/18  WRKCo Inc.                        8-K:1,2,9   3/06/18    3:424K                                   Globenewswire Inc./FA
12/19/17  WRKCo Inc.                        DEF 14A     2/02/18    2:2.7M                                   Donnelley … Solutions/FA
 8/24/17  WRKCo Inc.                        8-K:1,2,9   8/24/17    4:786K                                   Globenewswire Inc./FA
11/25/16  WRKCo Inc.                        10-K        9/30/16  119:26M
 8/09/16  WRKCo Inc.                        10-Q        6/30/16   76:12M
 5/10/16  WRKCo Inc.                        10-Q        3/31/16   74:12M
11/27/15  WRKCo Inc.                        10-K        9/30/15  121:23M
10/29/13  Meadwestvaco Corp.                8-K:1,9    10/28/13    2:1M                                     Donnelley … Solutions/FA
 4/25/13  Meadwestvaco Corp.                8-K:5,9     4/22/13    2:135K                                   Donnelley … Solutions/FA
 8/02/12  Rock-Tenn Co.                     10-Q        6/30/12   60:11M
 2/24/09  Meadwestvaco Corp.                10-K       12/31/08   15:2.4M                                   Donnelley … Solutions/FA
 2/01/08  Rock-Tenn Co.                     10-Q       12/31/07    6:350K                                   Bowne of Atlanta Inc./FA
 2/09/06  Rock-Tenn Co.                     10-Q       12/31/05    8:833K                                   Bowne of Atlanta Inc./FA
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