I bought the Large for a road bike, it is sturdy and well-made, and holds all the items indicated easily. I have my multi-tool and cell in the bottom, and levers, patch kit, money, ID, and 2 tubes in the top. I could probably slip in one or two smaller items without a problem. The pockets for the levers and patch kit are designed for Lezyne products (my Pedro levers wouldn't come close to fitting), so I ended up buying a pair of their Power Levers and the Smart Kit patches. Works well, although I haven't had occasion to use either yet (and hopefully won't for awhile). Lezyne makes good stuff, I have their Pressure Drive pump that has served me well for several thousand miles.