This saddle bag was big enough (ordered a M) to fit two tubes, two CO2 cartigages and valve, a Soma multitool, 3 tire levers, cardboard and hand wipes. Nice looking and a cool shape but the strap that wraps around the seat post doesn't lay flat (velcro) creating an abrasive surface that rubbed my shorts, in turn snagging them. No matter how many times I tried to flatten it during the ride it still flipped up. $190 shorts compared to $20 bag. Definitly returning it.