The specialized top tube pack when you need extra storage on the bike you take it where you can get it that39s why we designed our top tube pack to be a small out of the way solution for carrying your smaller ride essentials and gear it features a nylon coated mesh construction that39s weather resistant in order to keep the bag39s contents safe and dry which is further amplified by the weather resistant ykk zipper at the exterior and to make it easy to get on and off the bik