1Largecapacity space, independent separation, can put helmets, largecapacity structure can be expanded in one step, and the bag can be expanded at will according to needs, and various items can be easily loaded. 2Night reflective strip design, safer for night riding, waterproof and rainproof, environmentally friendly, formaldehydefree, wearresistant and durable. 3Material wearresistant fabric, comfortable to the touch, strong and wearresistant, customized highstrength buckle, durable and strong. 4The quality is trustworthy. Highquality double zipper, the zipper head is made of highquality metal, and the zipper is smooth. 5Breathable mesh, the cellular mesh of the shoulder straps increases air circulation, breathable and absorbs sweat.