Rapha Explore Top Tube BagThe Explore Top Tube Bag provides highly water resistant storage for easy access to your essentials on the go. Its tapered shape is specifically designed to fit on the top tube and minimize knee strike during your ride. This bag features a one handed opening for maximum convenience while cycling. It attaches to most adult bike frames using two Hypalon synthetic rubber straps for the top tube and one strap for the head tube to ensure a stable fit.