Premium Materials: Our products are made of hard-shell EVA material, which is waterproof, shock-proof, drop-resistant and wear-resistant, and it will protect the contents of the bag very well.Mesh storage design: Large capacity, double opening design, easy to open and close the bag, it can store keys, glasses, mobile phones, wallets and other items.The interior has a net pocket zipper layering.Classified storage design to prevent valuables from damaging.Easy to install and stable: Velcro straps are designed for easy installation and removal.The quick release buckle is used to install under the seat to provide double safety protection, so don't worry about the bump of the mountain road.Waterproof:Surface is made of waterproof carbon PU fabric, double sealed zipper design, don't worry about light rain, but don't soak in the rain for a long time.Humanized design and beautiful appearance: Reflective signs on the side of the bag provide safety tips at night. Black surface perfect match with various colors of bicycle metal.