Topeak fuel tank bag frame fit bagthe fuel tank is a large capacity top tube mounted bag giving a cyclist quick and easy access to energy bars phone wallet tools or any small essential gear you need to keep close at hand while riding the top opening zipper accessed divided main compartment keeps contents organized and secure featurescompartments 1 main 1 inner mesh pocket medium1 divided main 1 inner mesh pockets largecapacity 05 l30 ci medium or 075 l45 ci largematerial