Topeak BackLoader Bike Bag X-Large - 15L Black Cycling Bag Large Capacity 15L sizes to accommodate all your gear. Durable and Water-Resistant: Made from polyethylene and nylon, offering water repellency and stain resistance. Secure Mounting: Hook and loop fastener for quick and easy attachment and removal. Enhanced Stability: Compression straps and upgraded saddle mount system for a stable ride. Waterproof Inner Bag: Ensures your items stay dry with a 10,000 mm waterproof rating.