Waterproof design This bike bag features a waterproof design that protects contents from short-term, light rain. You can ride with peace of mind knowing your belongings stay dry and protected even if unexpected showers occur while you are riding. Compact and lightweight The bag has a small, lightweight form factor with just the right amount of storage for your bike essentials. It reduces load on the rider and contributes to a more comfortable cycling experience. Strong compatibility With a versatile design, this bike front bag is compatible with Brompton folding bikes, mountain bikes, and road bikes. It can be easily attached to a wide range of handlebars, enabling you to enrich your cycling adventures on almost any bike. Built-in key hook The built-in key hook lets you conveniently hang your keys inside the bag. This avoids rummaging through your belongings and provides quick access to your keys during your ride. Use scenarios - Daily commute in light rain: Keeps essential items dry and reachable during a rainy ride to work or school. - Short rides and errands: Provides compact storage for a small toolkit, spare tube, wallet, and other essentials without adding bulk. - Brompton folding bike trips: Attaches to a Brompton for easy access to essentials during quick stops and city rides.