Superior Waterproof Material: This triangular frame bag is made of waterproof nylon, providing excellent water and scratch resistance. It effectively prevents rainwater from entering the bag, protecting all your belongings and ensuring they remain dry and safe. Unique Design: This frame bag features a triangular design that fits perfectly between the saddle and top tube, providing a secure fit without hindering cycling. Non-slip: This triangular bike bag comes with 3 adjustable straps, preventing it from slipping even on uneven surfaces and making installation very easy. This bike bag is suitable for most mountain bikes and road bikes. Convenient and Practical: The ultra-thin design effectively reduces wind resistance and prevents leg injuries during cycling. Side zipper for easy on and off. Ideal for mountain bikes, road bikes, commuter bikes, etc. Large Capacity: Perfect for storing small items such as headphones, mobile phones, wallets, keys, tools, tire levers, tire repair tools, snacks, etc.