[Super Capacity]: Say goodbye to cluttered, crowded pockets! Our 17.3-inch, 2.9-liter bike bag easily holds hydration bladders, cell phones, sunglasses, and other essentials, making your ride more comfortable. Please measure your body measurements before purchasing! [Portable and Easy to Install]: This bike bag is lightweight (only 129g) and can be quickly removed without damaging the paintwork. Suitable for most adult bikes, mountain bikes, and road bikes. [Sturdy 4-Buckle Design]: This bike handlebar bag securely attaches to your bike with 4 reinforced buckles, ensuring it stays in place even on uneven terrain. Ride with confidence. [Durable and Waterproof]: This bike top tube bag is made of durable, wear-resistant checkered nylon, making it durable and easy to clean. Its outer fabric is highly waterproof, and the hidden zipper closure keeps your essentials well protected. [Humanized Design]: A. The narrow edge design conforms to the human movement curve, preventing leg abrasion while cycling and reducing air resistance. B. The side zipper allows you to place items with one hand for easy storage. C. Reflective logos on both sides of the bike bag ensure your safety when riding at night.