About this projectUpgraded Waterproof Design - Fully waterproof fabric, the bicycle bag is made of ultra-light and fashionable carbon fiber material, and the zipper adopts high-frequency seamless welding technology, which effectively prevents rainwater from entering the bag quickly. That's the secret of our waterproof bike frame bag.BIG STORAGE - The Bike Storage Rack Bag has enough interior space to store your phone, small tire pump, mini binoculars, bike glasses, bike repair tools and accessories, dust mask, keys, wallet and more. Solve the troubles of long-term outdoor riding.EASY INSTALLATION AND QUICK RELEASE: With 3 adjustable Velcro straps it can be easily attached to the tube. It doesn't move around even when you're riding rough roads, making it suitable for most mountain, road and commuter bikes.Humanized Design: Large zipper opening design for easy access. Durable zip closure. Reasonably sized and doesn't rub against the legs while riding. Reflective trims on both sides of the bag keep you safe on night rides. Ultra-thin body design, large capacity, and minimize wind resistance.