BBB Tools & Tubes Storage Bottle (Small - 450ml) is an alternative to an under seat pack. This small size canister is roomy enough for most purposes. Light weight, water proof and durable it can hold a tube, tyre levers, CO2 cylinder and inflator and tyre patches with little room left over. It can accommodate the same amount as a typical medium/large under seat bag and is much more convenient than carrying these items in a jersey pocket.
Fits in standard water bottle cages
Wide mouth makes access easy - with robust but simple screw lid