UPGRADE WATER-RESISTANT DESIGN - Full Water-Resistant Fabric, bike bags are made of ultralight and stylish carbon fiber material and the zippers adopt high frequency seamless welding technology, effectively block rainwater from entering the bag quickly. LARGE STROAGE SPACE - The bike storage frame bag has enough inside room for your phone, small tire pump, mini binoculars, cycling glasses, bicycle repair tools & accessories, dust masks, keys, wallets, etc. EASY TO INSTALL & QUICK RELEASE: With 3 Adjustable velcro straps can easily fasten on the tube. it doesn't move around even if you ride on a bumpy or rocky road, and fit most mountain, road and commute bike. HUMANIZATION DESIGN: ① Big zippered opening mouth design for easy access. Durable zipper closure. ② Reasonable size, it would not rubs against your legs while riding. ③ Reflective trim on both sides of bags to keep your night ride safety. ④ Slim body design with high capacity to minimize the wind resistance.