Exhibit 99(A)

SHAREHOLDERS AGREEMENT

This Shareholders Agreement (this "Agreement"), dated as of March 25, 2002, among the persons listed on Schedule 1 hereto (each, a "Holder" and,
collectively, the "Holders"), Enhance Packaging Technologies Inc., a Canadian corporation (the "Parent"), and EPT Newco, Inc., an Ohio corporation and a wholly owned subsidiary of the
Parent (the "Merger Subsidiary").

WHEREAS, the Parent, the Merger Subsidiary and Liqui-Box Corporation, an Ohio corporation (the "Company"), are entering into
an Agreement and Plan of Merger (the "Merger Agreement"), dated as of the date hereof, which provides for the merger of the Merger Subsidiary into the Company, with the Company surviving (the
"Merger");

WHEREAS, each Holder owns the number of common shares, without par value, of the Company (the "Shares") or options to purchase Shares (the
"Stock Options" and, collectively with the Shares, the "Optioned Securities"), or has the right to vote the number of Shares or other securities (the "Voting Securities"), listed opposite the name of
such Holder on Schedule 1;

WHEREAS, the board of directors of the Company has unanimously, with the exception of the Holders, who abstained, approved this Agreement,
the Merger Agreement and the Merger and the transactions contemplated hereby and thereby in accordance with the Ohio General Corporation Law, including but not limited to specifically for purposes of
Chapter 1704 thereof;

WHEREAS, the Parent and the Merger Subsidiary have required, as a condition to entering into the Merger Agreement, that the Holders enter
into this Agreement; and

WHEREAS, the Holders believe that it is in the best interest of the Company and its shareholders to induce the Parent and the Merger
Subsidiary to enter into the Merger Agreement and, therefore, the Holders are willing to enter into this Agreement.

NOW, THEREFORE, in consideration of the foregoing and the mutual covenants and agreements set forth herein and such other valuable
consideration the receipt of which is hereby acknowledged, the parties hereto, intending to be legally bound hereby, agree as follows:

1.The Option.Each Holder hereby grants the Parent or the Merger Subsidiary an irrevocable option to purchase
all of the Shares held by such Holder at a price of $67.00 per share and all of the Stock Options held by such Holder at a price equal to the excess of $67.00 per share over the applicable exercise
price per share, payable in cash, without interest (the "Option"); provided, however, that, if the price per share paid by the Parent or the Merger Subsidiary to other shareholders in connection with
the Merger is more than $70.18, the price per Share and price per Stock Option paid by the Parent or the Merger Subsidiary to the Holders shall be adjusted so that the Holders also receive the
difference between such higher price and $67.00; and provided, further, that, if, prior to the consummation of the Merger, in connection with an Acquisition Transaction (as defined in the Merger
Agreement) other than the Merger, the Parent or the Merger Subsidiary sells any of the Optioned Securities purchased by the Parent or the Merger Subsidiary from the Holders for a price per Share or
price per Stock Option in excess of the price per Share or price per Stock Option paid by the Parent or the Merger Subsidiary to the Holders, as adjusted, or any of the Optioned Securities purchased
by the Parent or the Merger Subsidiary from the Holders are cancelled in exchange for the right to receive from a third party not related to the Parent or the Merger Subsidiary an amount in cash in
excess of the price per Share or price per Stock Option paid by the Parent or the Merger Subsidiary to the Holders, as adjusted, the price per Share and price per Stock Option paid by the Parent or
the Merger Subsidiary to the Holders shall be further adjusted so that the Holders also receive the difference between such higher price or amount and the price per Share or price per Stock Option
paid to them by the Parent or the Merger Subsidiary.

---

2.Exercise of the Option; Term.



3.Closing.Any closing hereunder shall take place on the date specified by the Parent or the Merger Subsidiary
at the offices of Ballard Spahr Andrews & Ingersoll, LLP, 1735 Market Street, Philadelphia, Pennsylvania (the "Closing Date"). On the Closing Date:



4.Voting of Equity Securities.Each Holder hereby agrees that, during the period from the date of this
Agreement until the expiration of this Agreement, at any meeting of the shareholders of the Company, however called, and in any action by written consent of the shareholders of the Company, he shall
(a) vote all Voting Securities with respect to which such Holder then has the right to vote in favor

2

---

of the Merger; (b) not vote any Voting Securities with respect to which such Holder then has the right to vote in favor of any action or agreement which would result in a breach in any
material respect of any covenant, representation or warranty or any other obligation of the Company under the Merger Agreement; and (c) vote all Voting Securities with respect to which such
Holder then has the right to vote against any action or agreement which would impede, interfere with or attempt to discourage the Merger, including, but not limited to: (i) any proposal opposed
by the Parent or the Merger Subsidiary; (ii) any Acquisition Proposal (other than the Merger) involving the Company or any of its subsidiaries; (iii) any change in the management or
board of directors of the Company, except as otherwise agreed to in writing by the Merger Subsidiary; (iv) any material change in the present capitalization or dividend policy of the Company;
or (v) any other material change in the Company's corporate structure or business. In the event that either Holder does not comply with the foregoing sentence, such Holder shall be deemed to
have hereby irrevocably appointed designees of the Parent or the Merger Subsidiary, its attorneys, agents and proxies, with full power of substitution, for the undersigned and in the name, place and
stead of the undersigned to vote in such manner as such attorneys, agents and proxies or their substitutes shall in their sole discretion deem proper and otherwise act, including the execution of
written consents, with respect to all Voting Securities of the Company which the undersigned is or may be entitled to vote at any meeting of the Company held after the date hereof, whether annual or
special and whether or not an adjourned meeting, or in respect of which the undersigned is or may be entitled to act by written consent. This proxy shall be coupled with an interest and shall be
irrevocable and binding on any successor in interest of the applicable undersigned Holder. This proxy shall operate to revoke any prior proxy as to Voting Securities heretofore granted by the Holder
and shall terminate upon the expiration of this Agreement.

5.Covenants of the Holders.





3

---



6.Representations and Warranties of each Holder.Each Holder severally and not jointly represents and warrants
to Parent and the Merger Subsidiary as follows:



7.Effect of Representations, Warranties and Covenants of the Holders.The representations, warranties and
covenants of the Holders shall be several and not joint. The liability of each individual Holder shall extend only to the representations, warranties and covenants of such Holder and not to any
representation, warranty or covenant of any other Holder.

8.Representations and Warranties of the Parent and the Merger Subsidiary.Each of the Parent and the Merger
Subsidiary represents and warrants to each Holder that: it is a corporation duly

4

---

incorporated under the laws of Canada and the State of Ohio, respectively; it has all requisite corporate power and authority to enter into and perform all its obligations under this Agreement; the
execution and delivery of this Agreement and the consummation of the transactions contemplated hereby have been duly authorized by all necessary corporate action on its part; this Agreement has been
duly executed and delivered by it; and this Agreement constitutes a valid and binding agreement on its part, enforceable in accordance with its terms, subject to applicable bankruptcy, insolvency,
moratorium or other similar laws relating to creditors' rights and general principles of equity.

9.Adjustments.In the event of any increase or decrease or other change in the Optioned Securities by reason of
stock dividend, stock split, recapitalizations, combinations, exchanges of shares or the like, the number of Optioned Securities and Voting Securities subject to this Agreement shall be adjusted
appropriately.

10.Restrictions on Transfer.As soon as practicable after the execution of this Agreement, each Holder shall
instruct the transfer agent to place a stop transfer order on its records with respect to such Holder's Optioned Securities or place the following legend s on the certificates representing such
Holder's Optioned Securities:



11.Resignations.Samuel B. Davis and Samuel N. Davis agree to resign from the board of directors of the Company
and as officers of the Company prior to the Effective Time.

12.Governing Law.This Agreement shall be governed by and construed in accordance with the law of the State of
Delaware without regard to its rules of conflict of laws.

13.VENUE.THE PARTIES HEREBY IRREVOCABLY SUBMIT TO THE JURISDICTION OF THE COURTS OF THE STATE OF DELAWARE AND
THE FEDERAL COURTS OF THE UNITED STATES OF AMERICA LOCATED IN THE COUNTY OF NEW CASTLE, DELAWARE SOLELY IN RESPECT OF THE INTERPRETATION AND ENFORCEMENT OF THE PROVISIONS OF THIS AGREEMENT AND OF THE
OTHER DOCUMENTS REFERRED TO IN THIS AGREEMENT, AND IN RESPECT OF THE TRANSACTIONS CONTEMPLATED HEREBY AND THEREBY, AND HEREBY WAIVE, AND AGREE NOT TO ASSERT, AS A DEFENSE IN ANY ACTION, SUIT OR
PROCEEDING FOR THE INTERPRETATION OR ENFORCEMENT HEREOF OR OF ANY SUCH DOCUMENT, THAT IT IS NOT SUBJECT THERETO OR THAT SUCH ACTION, SUIT OR PROCEEDING MAY NOT BE BROUGHT OR IS NOT MAINTAINABLE IN
SAID COURTS OR THAT THE VENUE THEREOF MAY NOT BE APPROPRIATE OR THAT THIS AGREEMENT OR ANY SUCH DOCUMENT MAY NOT BE ENFORCED IN OR BY SUCH COURTS, AND THE PARTIES HERETO IRREVOCABLY AGREE THAT ALL
CLAIMS WITH RESPECT TO SUCH ACTION OR PROCEEDING SHALL BE HEARD AND DETERMINED IN SUCH A DELAWARE STATE OR FEDERAL COURT. THE PARTIES HEREBY CONSENT TO AND GRANT ANY SUCH COURT JURISDICTION OVER THE
PERSON OF SUCH PARTIES AND OVER THE SUBJECT MATTER OF SUCH DISPUTE AND AGREE THAT MAILING OF PROCESS OR OTHER PAPERS IN CONNECTION WITH ANY SUCH ACTION OR PROCEEDING IN THE MANNER PROVIDED IN SECTION
18 OR IN SUCH OTHER MANNER AS MAY BE PERMITTED BY LAW, SHALL BE VALID AND SUFFICIENT SERVICE THEREOF.

14.Waiver of Conflicts.Each Holder severally acknowledges and represents that (i) Vorys, Sater, Seymour
and Pease LLP has in the past and may continue to perform legal services for the Company and certain of the Holders in matters unrelated to the transactions described in this Agreement;

5

---

(ii) Vorys, Sater, Seymour and Pease LLP is representing both the Company and the Holders in the transaction contemplated by this Agreement; (iii) they have been given the opportunity
to ask for information relevant to the representation by Vorys, Sater, Seymour and Pease LLP of both the Company and the Holders in connection with the transaction contemplated by this Agreement. Each
Holder represents that, after such disclosure, each Holder has requested that Vorys, Sater, Seymour and Pease LLP represent such Holder in connection with the transactions contemplated by this
Agreement and each of the Holders hereby gives its informed consent to the representation by Vorys, Sater, Seymour and Pease LLP of both the Company and the Holders in connection with the transactions
contemplated hereby.

15.Further Assurances.Each party hereto shall perform such further acts and execute such further documents as
may reasonably be required to carry out the provisions of this Agreement.

16.Assignment.This Agreement may not be assigned by any party hereto, except that the Parent or the Merger
Subsidiary may assign their respective rights and obligations under this Agreement to any of their respective wholly owned subsidiaries or affiliates.

17.Remedies.The parties agree that legal remedies for breach of this Agreement will be inadequate and that
this Agreement may be enforced by the Parent and the Merger Subsidiary by injunctive relief, specific performance or other equitable remedies.

18.Notices.All notices or other communications required or permitted hereunder shall be in writing (except as
otherwise provided herein) and shall be deemed duly given if delivered in person, by confirmed facsimile transmission or by overnight courier service, addressed as follows:

To
the Parent or the Merger Subsidiary:



With
a copy to:



To
each Holder:



With
copies to:



19.Severability.If any term or other provision of this Agreement is invalid, illegal or incapable of being
enforced by any rule of law or public policy, all other conditions and provisions of this Agreement shall nevertheless remain in full force and effect so long as the economic or legal substance

6

---

of the transactions contemplated hereby is not affected in any manner adverse to any party. Upon such determination that any term or other provision is invalid, illegal or incapable of being
enforced, the parties hereto shall negotiate in good faith to modify this Agreement so as to effect the original intent of the parties as closely as possible in an acceptable manner to the end that
the transactions contemplated hereby are fulfilled to the extent possible.

20.Binding Effect; Benefits.This Agreement shall survive the death or incapacity of any Holder and shall inure
to the benefit of and be binding upon the parties hereto and their respective heirs, legal representatives, successors and permitted assigns. Nothing in this Agreement, expressed or implied, is
intended to or shall confer on any person other than the parties hereto and their respective heirs, legal representatives and successors and permitted assigns any rights, remedies, obligations or
liabilities under or by reason of this Agreement.

21.Termination.This Agreement shall commence on the date hereof and terminate upon the expiration of the
Option.

22.Counterparts.This Agreement may be executed in counterparts, each of which shall be deemed to be an
original, but all of which together shall constitute one and the same agreement.

[Signatures
appear on the following pages.]

7

---

IN
WITNESS WHEREOF, the Parent, the Merger Subsidiary and the Holders have entered into this Agreement as of the date first written above.

| |  | ENHANCE PACKAGING TECHNOLOGIES INC.
| |  | -----------------------------------
| |  | By:                                

| |  | EPT NEWCO, INC.
| |  | ---------------
| |  | By:            

[Remainder
of page intentionally left blank]

8

---

| | HOLDERS:                                                                                                                                                                                                                                                                                                                                                
| | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |                                                                                                                                                                                                                                                                                                                                                         
| | /s/S. B. DAVISSamuel B. Davis, individually, as Trustee under the Samuel B. Davis 2002 Grantor
Retained Annuity Trust, as Trustee under the Samuel B. Davis Revocable Trust, as Successor Trustee under the Davis Family Trust and as Voting Trustee under that certain Voting Trust and Right of First Refusal Agreement dated as of September 29,
1993
| |                                                                                                                                                                                                                                                                                                                                                         
| | /s/SAMUEL N. DAVISSamuel N. Davis                                                                                                                                                                                                                                                                                                                       
| | Address for all Holders:                                                                                                                                                                                                                                                                                                                                
| | c/o Liqui-Box Corporation
6950 Worthington-Galena Road
Worthington, Ohio 43085
Fax: 614-888-0982                                                                                                                                                                                                                                                        

GUARANTEE OF DUPONT CANADA INC.

DuPont Canada Inc., on behalf of itself and its successors and assigns, hereby guarantees the obligations of the Parent and the Merger Subsidiary and their
successors and assigns with respect to this agreement.

| |  | DUPONT CANADA INC.
| |  | ------------------
| |  | By:               

9

---

SCHEDULE 1

|Name            |  | Shares    |   | Stock Options |   | Voting Securities |     
|--------------- |  | --------- | - | ------------- | - | ----------------- | ----
|Samuel B. Davis |  | 957,310(1 | ) | 359,739(2     | ) | 1,496,728(3       | )   
|Samuel N. Davis |  | 80,395(4  | ) | 110,547(5     | ) | 82,378(4          | )(6)

---

10

---

QuickLinks