Topeak fuel tank top tube bagwith its large capacity and easy to mount design, topeak's tank bag style bag keeps everything you need for your ride within easy reach. It will hold and organise your important items such as your phone, keys, bike tools and energy bars gels. This means you can head out on a long ride with the extra confidence of having all your essentials and without having to carry extra weight in your jersey pockets.touring and adventure easy storage conveniencefeaturing a top opening zipper for easy, convenient access simply stop at the side of the trail or cycle path and get access to what you require. The large bag has a main compartment which is divided for supreme organising so you can split your items to how you want them stored for complete convenience and efficiency, while the medium features an inner mesh pocket to keep items separate from the main compartment. This bag is a touring cyclists and weekend adventure cyclists dream you no longer need to carry a small backpack as the fuel tank frame fit bag can do all the cargo haulage for you.featuresmaterial 420 denier nylon pvc spongecompartments 1 main, 1 inner mesh pocket medium 1 divided main, 1 inner mesh pockets largesize l x w x h 17.5x7.5x11cm medium 24x7.5x11cm largecapacity 0.5 l 30 ci medium or 0.75 l 45 ci largebag attachment nylon strapstop tube diameter fits 38 52mmhead tube diameter fits 34 75mmadded features good for holding mobile phone, energy bars, wallet, tools etcsuits all bike typesbattery cable access for charging your smartphone on a ridepadded compartment protects contentsweight medium 120g large 150gbuy topeak accessories from chain reaction cycles, the world's largest online bike store.