JOINT FILING AGREEMENT

                                                             Page 11 of 75 Pages

                                    EXHIBIT Y

                             JOINT FILING AGREEMENT


                  The  undersigned  hereby agree that the Amendment No. 5 to the
statement on Schedule  13D with  respect to the Common  Stock of Bluefly,  Inc.,
dated  August 25, 2000,  is, and any  amendments  thereto  signed by each of the
undersigned  shall  be,  filed  on  behalf  of  each  of us  pursuant  to and in
accordance  with the provisions of Rule 13d-1(f)  under the Securities  Exchange
Act of 1934.

Date:  August 25, 2000
                                       QUANTUM INDUSTRIAL PARTNERS LDC


                                       By:      /S/ Xxxxxxx X. Xxxx
                                                --------------------
                                                Xxxxxxx X. Xxxx
                                                Attorney-in-Fact


                                       QIH MANAGEMENT INVESTOR, L.P.

                                       By:      QIH Management, Inc.,
                                                its General Partner


                                       By:      /S/ Xxxxxxx X. Xxxx
                                                -------------------
                                                Xxxxxxx X. Xxxx
                                                Vice President


                                       QIH MANAGEMENT, INC.


                                       By:      /S/ Xxxxxxx X. Xxxx
                                                -------------------
                                                Xxxxxxx X. Xxxx
                                                Vice President


                                       XXXXX FUND MANAGEMENT LLC


                                       By:      /S/ Xxxxxxx X. Xxxx
                                                -------------------
                                                Xxxxxxx X. Xxxx
                                                Deputy General Counsel


                                       XXXXXX XXXXX


                                       By:      /S/ Xxxxxxx X. Xxxx
                                                -------------------
                                                Xxxxxxx X. Xxxx
                                                Attorney-in-Fact