I've located my seat bag: The only indicator that it's a Cannondale are the "Station" logos on the zipper pulls. The rough dimensions are: 11 x 3 5/8 x 1 5/8-inches. The side pocket zippers are about 6 1/2-inches long. A buckled, 3/4-inch wide, strap supports the bag from the bottom and loops around the seat rails, and a hook-n-loop strap anchors it to the seat post. Each of the zipper pulls has a bit of cord looped through it serving as a fob. Mine is gray (Gortex?) with black stitching and findings. If you are really interested, I wouldn't think it would be overly complicated to duplicate one (If you have experience making this sort of thing).
Pete Imandt
"donut-free" in
Ramona CA