High Quality: The riding side bag is made of 600D waterproof PVC nylon, and the back seat travel bag is processed, which has high tear and scratch resistance, and is durable. Size : The rear duffel bag size of this bike is 31.5*31.5*16/12.4*12.4*6.3 inch. It has 2 external elastic mesh pockets for storing water bottles, umbrellas and rain covers. Easy to Install: The practical bike bag can be installed with a firm and easy belt and Velcro to adjust, and can be connected to different types of luggage racks without tools. Reflective Design: When riding at night, the reflective rubber bone and surface reflective signs of the bike bag are easy to see , which improves riding safety. Wide Range of Uses: This bicycle bag is suitable for most mountain bikes and all-terrain bikes with rear seats, such as mountain bikes, bicycles city bikes, off-road racing and road bikes.