Go to your local Army/Navy military surplus store. They usually stock a whole slew of pouches in various sizes and shapes. You should be able to find something that you can strap to your frame.
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C'dale BBU('05 and '09)/Super Six/Hooligan8and 3,Kona Dew Deluxe,Novara Buzz/Safari,Surly Big Dummy,Marin Pt Reyes,Giant Defy 1,Schwinn DBX SuperSport,Brompton S6L/S2E-X/M6L-X/S12 T Line
