PURCHASE AGREEMENT

     Credit Suisse Trust (the "Trust"), a business trust organized under the
laws of the Commonwealth of Massachusetts, with respect to the Commodity Return
Strategy Portfolio (the "Portfolio"), and Credit Suisse Asset Management, LLC
("CSAM") hereby agree as follows:

     1. The Trust offers CSAM and CSAM hereby purchases one share of beneficial
interest in the Portfolio, having a par value $.001 per share, at a price of
$10.00 (the "Initial Share"). CSAM hereby acknowledges receipt of the
certificate representing the Initial Share, and the Trust hereby acknowledges
receipt from CSAM of $10.00 in full payment for the Initial Share.

     2. CSAM represents and warrants to the Trust that the Initial Share is
being acquired for investment purposes and not for the purpose of distribution.

     3. CSAM agrees that if any holder of the Initial Share of the Portfolio
redeems it before one year after the date upon which the Portfolio commences its
investment activities, the redemption proceeds will be reduced by the amount of
unamortized organizational and offering expenses with respect to the Portfolio.
The parties hereby acknowledge that any shares acquired by CSAM other than the
Initial Share have not been acquired to fulfill the requirements of Section 14
of the Investment Company Act of 1940, as amended, and, if redeemed, their
redemption proceeds will not be subject to reduction based on the unamortized
organizational and offering expenses of the Portfolio.

     4. The Trust and CSAM agree that the obligations of the Trust under this
Agreement will not be binding upon any of the Trustees, shareholders, nominees,
officers, employees or agents, whether past, present or future, of the Trust,
individually, but are binding only upon the assets and property of the Trust, as
provided in the Declaration of Trust and the by-laws of the Trust. The execution
and delivery of this Agreement have been authorized by the Trustees of the
Trust, and signed by an authorized officer of the Trust, acting as such, and
neither the authorization by the Trustees nor the execution and delivery by the
officer will be deemed to have been made by any of them individually or to
impose any liability on any of them personally, but will bind only the Trust
property of the Trust as provided in the Declaration of Trust and the by-laws of
the Trust. No series of the Trust, including the Portfolio, will be liable for
any claims against any other series.





     IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of
the day of____________, 2005.

                                     CREDIT SUISSE TRUST


                                     By:
                                         -----------------------------------
                                         Name:
                                         Title:
ATTEST:


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                                     CREDIT SUISSE ASSET MANAGEMENT, LLC


                                     By:
                                         -----------------------------------
                                         Name:
                                         Title:
ATTEST:


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