Ride with confidence in all weather conditions. The rockbros as-151 waterproof top tube bag combines durability, practicality, and sleek design made for cyclists who value both protection and comfort. Key features: 100% waterproof construction: high-frequency seamless welding with waterproof fabric keeps your essentials dry, even in heavy rain. Built-in pp support plate: maintains a firm shape, prevents collapsing, and protects items from squeezing or impact. Narrow streamlined design: fits closely to the frame and avoids leg contact for a smoother, more comfortable ride. Top opening zipper: easy to open and access your items quickly during rides. Reflective logo: improves visibility and safety during night rides. Tool-free installation: adjustable velcro straps allow quick mounting and removal stable and secure on any terrain. 1L practical capacity: perfect for storing daily riding essentials such as keys, tools, phone, or energy bars. Specifications: material: 30% nylon 70% polyester support plate: pp polypropylene capacity: 1l weight: 109g with straps compatible with: road bikes, gravel bikes, and mountain bikes why you’ll love it:sleek, weatherproof, and built to last the rockbros as-151 keeps your essentials safe while you focus on the ride. Whether it’s your daily commute or a long-distance cycling trip, this compact top tube bag ensures comfort, performance, and protection.