<?xml version="1.0"?><?xml-stylesheet type="text/xsl" href="../4_X02.xsl"?><ownershipDocument>    <schemaVersion>X0303</schemaVersion>    <documentType>4</documentType>    <periodOfReport>2008-12-24</periodOfReport>    <notSubjectToSection16>0</notSubjectToSection16>    <issuer>        <issuerCik>0001325281</issuerCik>        <issuerName>KAPSTONE PAPER &amp; PACKAGING CORP</issuerName>        <issuerTradingSymbol>KPPC</issuerTradingSymbol>    </issuer>    <reportingOwner>        <reportingOwnerId>            <rptOwnerCik>0001098385</rptOwnerCik>            <rptOwnerName>FELDMAN ROGER</rptOwnerName>        </reportingOwnerId>        <reportingOwnerAddress>            <rptOwnerStreet1>C/O WEST CREEK CAPITAL</rptOwnerStreet1>            <rptOwnerStreet2>1919 PENNSYLVANIA AVE., N.W. STE. 725</rptOwnerStreet2>            <rptOwnerCity>WASHINGTON</rptOwnerCity>            <rptOwnerState>DC</rptOwnerState>            <rptOwnerZipCode>20006</rptOwnerZipCode>            <rptOwnerStateDescription></rptOwnerStateDescription>        </reportingOwnerAddress>        <reportingOwnerRelationship>            <isDirector>0</isDirector>            <isOfficer>0</isOfficer>            <isTenPercentOwner>1</isTenPercentOwner>            <isOther>0</isOther>            <officerTitle></officerTitle>            <otherText></otherText>        </reportingOwnerRelationship>    </reportingOwner>    <reportingOwner>        <reportingOwnerId>            <rptOwnerCik>0001098386</rptOwnerCik>            <rptOwnerName>HANERFELD HARVEY</rptOwnerName>        </reportingOwnerId>        <reportingOwnerAddress>            <rptOwnerStreet1>C/O WEST CREEK CAPITAL</rptOwnerStreet1>            <rptOwnerStreet2>1919 PENNSYLVANIA AVE., N.W., STE. 725</rptOwnerStreet2>            <rptOwnerCity>WASHINGTON</rptOwnerCity>            <rptOwnerState>DC</rptOwnerState>            <rptOwnerZipCode>20006</rptOwnerZipCode>            <rptOwnerStateDescription></rptOwnerStateDescription>        </reportingOwnerAddress>        <reportingOwnerRelationship>            <isDirector>0</isDirector>            <isOfficer>0</isOfficer>            <isTenPercentOwner>1</isTenPercentOwner>            <isOther>0</isOther>            <officerTitle></officerTitle>            <otherText></otherText>        </reportingOwnerRelationship>    </reportingOwner>    <nonDerivativeTable>        <nonDerivativeTransaction>            <securityTitle>                <value>Common Stock</value>            </securityTitle>            <transactionDate>                <value>2008-12-24</value>            </transactionDate>            <deemedExecutionDate>                <value>2008-12-24</value>            </deemedExecutionDate>            <transactionCoding>                <transactionFormType>4</transactionFormType>                <transactionCode>P</transactionCode>                <equitySwapInvolved>0</equitySwapInvolved>            </transactionCoding>            <transactionTimeliness>                <value></value>            </transactionTimeliness>            <transactionAmounts>                <transactionShares>                    <value>5900</value>                </transactionShares>                <transactionPricePerShare>                    <value>2.1485</value>                </transactionPricePerShare>                <transactionAcquiredDisposedCode>                    <value>A</value>                </transactionAcquiredDisposedCode>            </transactionAmounts>            <postTransactionAmounts>                <sharesOwnedFollowingTransaction>                    <value>2664758</value>                </sharesOwnedFollowingTransaction>            </postTransactionAmounts>            <ownershipNature>                <directOrIndirectOwnership>                    <value>I</value>                </directOrIndirectOwnership>                <natureOfOwnership>                    <value>See Note</value>                    <footnoteId id="F1"/>                </natureOfOwnership>            </ownershipNature>        </nonDerivativeTransaction>        <nonDerivativeTransaction>            <securityTitle>                <value>Common Stock</value>            </securityTitle>            <transactionDate>                <value>2008-12-29</value>            </transactionDate>            <deemedExecutionDate>                <value>2008-12-29</value>            </deemedExecutionDate>            <transactionCoding>                <transactionFormType>4</transactionFormType>                <transactionCode>P</transactionCode>                <equitySwapInvolved>0</equitySwapInvolved>            </transactionCoding>            <transactionTimeliness>                <value></value>            </transactionTimeliness>            <transactionAmounts>                <transactionShares>                    <value>33175</value>                </transactionShares>                <transactionPricePerShare>                    <value>2.0778</value>                </transactionPricePerShare>                <transactionAcquiredDisposedCode>                    <value>A</value>                </transactionAcquiredDisposedCode>            </transactionAmounts>            <postTransactionAmounts>                <sharesOwnedFollowingTransaction>                    <value>2697933</value>                </sharesOwnedFollowingTransaction>            </postTransactionAmounts>            <ownershipNature>                <directOrIndirectOwnership>                    <value>I</value>                </directOrIndirectOwnership>                <natureOfOwnership>                    <value>See Note</value>                    <footnoteId id="F1"/>                </natureOfOwnership>            </ownershipNature>        </nonDerivativeTransaction>    </nonDerivativeTable>    <derivativeTable></derivativeTable>    <footnotes>        <footnote id="F1">Roger Feldman and Harvey Hanerfeld (the &quot;Reporting Persons&quot;) are the sole managing members of West Creek Capital, LLC, a Delaware limited liability company (formerly West Creek Capital, L.P., a Delaware limited partnership) that is the investment adviser to (i) West Creek Partners Fund L.P., a Delaware limited partnership (&quot;Partners Fund&quot;), (ii) WC Select L.P., a Delaware limited partnership (&quot;Select&quot;), (iii) Cumberland Investment Partners, L.L.C., a Delaware limited liability company (&quot;Cumberland&quot;), and (iv) certain private accounts (the &quot;Accounts&quot;). These securities are held directly by Partners Fund, Select, Cumberland, or one of the Accounts for the benefit of their respective partners, members or owners.  The Reporting Persons disclaim beneficial ownership of these securities except to the extent of their pecuniary interest therein.</footnote>    </footnotes>    <remarks></remarks>    <ownerSignature>        <signatureName>Roger Feldman</signatureName>        <signatureDate>2008-12-30</signatureDate>    </ownerSignature>    <ownerSignature>        <signatureName>Harvey Hanerfeld</signatureName>        <signatureDate>2008-12-30</signatureDate>    </ownerSignature></ownershipDocument>