- Water resistant design: Full water resistant fabric with ultralight carbon fiber material. Zippers use high frequency seamless welding technology to block rainwater quickly, helping protect contents from moisture on wet rides. - 1.5 L storage capacity and dimensions: Approx 1.5 L inside space for items such as your phone, small tire pump, mini binoculars, cycling glasses, bicycle repair tools and accessories, dust masks, keys, wallets, and more. Dimensions: Length about 10.63 inches, Width about 7.08 inches, Height about 2.25 inches. - Easy to install and secure: Quick release with 3 adjustable Velcro straps to fasten on the frame tube. Keeps the bag in place on bumpy or rocky roads and fits most mountain and commuter bikes. Note: The triangle bag is at a right angle and is suitable for mounting on a bicycle with a right-angle bracket. - Protection and durability: Outer layer made of PU polyester, middle layer of 5 mm foam, inner layer of polyester cloth. The outer layer is wear resistant, and the foam layer protects the contents from damage. - Use scenarios: - Long outdoor rides or weekend trail adventures where you need quick access to a phone, tools, and small essentials without removing the bag. - Daily commuting to store keys, wallet, masks, and compact repair tools, keeping valuables dry and secure. - Short bike tours or city trips where weather can vary, providing reliable moisture protection for your gear.