The topeak fast fuel tribag dry bag stylish slim top tube mounted bag giving cyclists quick and easy access to energy bars smartphone wallet tools or any small essential gear they need close at hand topeak fast fuel tribag dry bag features 600 denier polyester tpu clear top cover adjustable nylon straps main padded compartment with dividers fits 38 52mm diameter top tubes and 53 75mm diameter head tubes small 06l 24x85x55cm 145g large 07l 29x85x55cm