High Quality Bicycle Rear Seat Bag: Made of high-end 900D polyester, which ensures the quality and elegant appearance. Designed with waterproofing zipper and easy to pull. Bike Trunk Bag with Multiple Functions: Fashion design and convenient to carry. Velcro strap is easy to installation and release. Commes with extra adjustable shoulder strap. You can also use it as a regular bag/shoulder bag. Large Capacity - 12L: 14.7inch*6.5inch*9inch. This bag includes a main compartment, 2 inside pockets, an outside bag and a back pocket. Large enough to keep your essentials well organized. The internal patch pocket makes the space effectively used. you can store your wallet, phones, towels, small tools, outdoor products, water bottles, maps, food, etc. Easy to Install and Release: 4 fastener strap for easy and quick installation on all types of bicycles with a rear seat, such as mountain bike, road bike, etc. Designed with Tail Light Hanger: For the safety you can hang a taillight on the hanger when in darkness.