Ergonomic design, the backpack fits the curve of the back, thereby improving the comfort of the backpack. Built-in double aviation aluminum bars, reduces the weight of the backpack, but also enhances the carrying capacity. The height of the back pad is adjustable to suit different body types. Reflective webbing make you walking at night safer. Thickened shoulder straps and highly elastic breathable back support provide you with optimal breathability and reduce your burden.