Modular design: Through the connection of buckle and hook, each bag can be combined to achieve 2 in 1, 3 in 1, 4 in 1.Fully open and large storage capacity, meet the travel needs. Fully waterproof inner bag: voltage inner bag with zipper is removable, no need to worry about riding in rain. Anti-slip net bag: can hang wet clothes, etc.,while increasing friction, making it more stable and firm when riding.Material: Polyester.10L:23*10.5*46.5cm, 700g20L:26*18*59cm, 1050g30L:30*20*65cm, 1150g,each bag has buckle*4, band*4, 10L has one shoudler strap, 20/30L has two shoulder straps.Waterproof zipper cap prevent rain intrusion; hook on loops can connect to other bag; brand buckles are solid and durable; webbing can hang objects; silver reflective logo makes it safer to ride at night.Multiple uses: Motorcycle pannier bag/ Fuel tank bag/ connect the shoulder strap to use it as a shoulder bag or backpack.