Paladineer Hiking Backpack Lightweight Cycling Backpack 18L Made of professional moistureproof nylon,easy and convenient to use. A soft mesh pad in the back so as not to store heat and make you hot and sweaty. The shoulder straps made with the soft breathable mesh as well. The shoulder straps, the belt and chest straps to keep you feel safe and to secure your body. Adjustable chest straps and waist straps to be adjusted as you wish to make you feel comfortable.A helmet cover attaching directly to the outside of the bag. This backpack designed according to human body engineering mechanics principles,labor-saving and comfortable.