SEC Form 4

FORM 4		UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response: 0.5
	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person* SOULELES THOMAS S (Last) (First) (Middle) THREE FIRST NATIONAL PLAZA SUITE 3800 (Street) CHICAGO IL 60602 (City) (State) (Zip)	2. Issuer Name and Ticker or Trading Symbol PACKAGING CORP OF AMERICA [ PKG ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X Director 10% Owner Officer (give title below) Other (specify below)
	3. Date of Earliest Transaction (Month/Day/Year) 07/23/2007
	4. If Amendment, Date of Original Filed (Month/Day/Year)	6. Individual or Joint/Group Filing (Check Applicable Line) X Form filed by One Reporting Person Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock, $0.01 par value	07/23/2007		J(1)		5,000,000	D	$0	1,773,010	I	Through PCA Holdings LLC(2)(3)
Common Stock, $.01 par value	07/23/2007		J(4)		10,386	A	$0	42,707	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Reflects a pro rata distribution of shares of common stock of the issuer by PCA Holdings LLC ("Holdings"), the record and direct beneficial owner of the shares, to its two members, Madison Dearborn Capital Partners III, L.P. ("MDCP III") and a fund affiliated with MDCP III (collectively, the "Funds") on July 23, 2007, which shares were further distributed pro rata (i) by the Funds to their respective general and limited partners on that date, including Madison Dearborn Partners III, L.P. ("MDP III"), the sole general partner of MDCP III and the fund affiliated with MDCP III, and (ii) by MDP III to its partners on that date.

2. The reporting person expressly disclaims beneficial ownership of 1,773,010 shares reported in Table I as indirectly beneficially owned, except to the extent of his pecuniary interest therein, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of the reported shares for purposes of Section 16 or for any other purpose.

3. Holdings is the record and direct beneficial owner of the reported shares. The shares held by Holdings may be deemed to be beneficially owned by MDCP III, the managing member of Holdings, and a fund affiliated with MDCP III. In addition, securities over which MDCP III has voting and dispositive power may be deemed to be beneficially owned by MDP III. John A. Canning, Paul J. Finnegan and Samuel M. Mencoff are the sole members of a limited partner committee of MDP III that have the power, acting by majority vote, to vote or dispose of the shares directly held by MDCP III. Messrs. Canning, Finnegan and Mencoff and MDP III each hereby disclaims any beneficial ownership of any shares over which MDCP III has voting and dispositive power. The reporting person is a partner of MDP III and may be deemed to have an indirect pecuniary interest in the shares owned by Holdings to the extent of the reporting person's indirect proportionate interest in Holdings.

4. Consists of shares of common stock of the issuer received by the reporting person as a result of the distribution by MDP III to its partners.

	/s/ THOMAS S. SOULELES	07/23/2007
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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