Exhibit 24

                                   COSI, INC.

                                Power of Attorney

      KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes
and appoints Vicki J. Baue his or her true and lawful attorney-in-fact and agent
in any and all capacities, to:

      1.       execute for and on behalf of the undersigned, in the
            undersigned's capacity as an officer and/or director of Cosi, Inc.
            (the "Company"), Forms 3, 4, and 5 in accordance with Section 16(a)
            of the Securities Exchange Act of 1934, as amended ("Exchange Act"),
            and the rules thereunder;

      2.       do and perform any and all acts for and on behalf of the
            undersigned which may be necessary or desirable to complete and
            execute any such Form 3, 4, or 5, complete and execute any amendment
            or amendments thereto, and timely file such form with the United
            States Securities and Exchange Commission and any stock exchange or
            similar authority; and

      3.       take any other action of any type whatsoever in connection with
            the foregoing which, in the opinion of such attorney-in-fact, may be
            of benefit to, in the best interest of, or legally required by, the
            undersigned, it being understood that the documents executed by such
            attorney-in-fact on behalf of the undersigned pursuant to this Power
            of Attorney shall be in such form and shall contain such terms and
            conditions as such attorney-in-fact may approve in such
            attorney-in-fact's discretion.

      The undersigned hereby grants to each such attorney-in-fact full power and
authority to do and perform any and every act and thing whatsoever requisite,
necessary, or proper to be done in the exercise of any of the rights and powers
herein granted, as fully to all intents and purposes as the undersigned might or
could do if personally present, with full power of substitution or revocation,
hereby ratifying and confirming all that such attorney-in-fact, or such
attorney-in-fact's substitute or substitutes, shall lawfully do or cause to be
done by virtue of this power of attorney and the rights and powers herein
granted. The undersigned acknowledges that the foregoing attorney-in-fact, in
serving in such capacity at the request of the undersigned, is not assuming, nor
is the Company assuming, any of the undersigned's responsibilities to comply
with Section 16 of the Exchange Act.

      This Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file Forms 3, 4, and 5 with respect to the
undersigned's holdings of and transactions in securities issued by the Company,
unless earlier revoked by the undersigned in a signed writing delivered to the
foregoing attorneys-in-fact.

      IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to
be executed as of this 22nd day of May, 2006.


                                        By: /s/ CHRISTOPHER J. CARROLL
                                            ------------------------------------
                                            Name:   Christopher J. Carroll
                                            Title:  Executive Vice President &
                                                    Chief Marketing Officer