Large Capacity8L large capacity, enough to store wallets, cell phones, power banks, towels, gadgets, outdoor supplies, water bottles, food, etc. Meet your daily riding needs. High Quality Hydrophobic MaterialUsing high quality PU leather waterproof material, rainproof and easy to clean. Special laminated waterproof zipper keeps rain water out. Comes with an extra rain cover, which can be used for real downpours. Higher SafetyThe bike bag is equipped with a large reflective surface to improve visibility at night. It provides safer night riding for cyclists. Equipped with reflective stickers. StabilityThe bike rear seat bag comes with 2 adjustable fixing velcros, which can be easily installed and uninstalled in a minute. It is suitable for most bike racks, such as mountain bikes and road bikes. Multi-functional useBike bag including 1 main bag, 1 side pocket and top strap, it can hold anything you need, whether you're using it for global adventures, biking or a weekend getaway.