ChineOn Outdoor Military 3P Attack Tactical Backpack Camping Hiking Trekking Bag 30L Adjustable carrying system makes it possible for users to adjust the backpack to optimal position and reduce fatigue owing to heavy load effectively Chest belts can adjust distance between the two shoulder straps and strengthen the stability of the backpack. Moreover, it is propitious to breathe Enhanced back support for ventilation and comfort The waist belts which are made from high-elasticity epispastics foam can disperse the load to the lumbar area more effectively. It makes the backpack more comfortable Package Content: 1X Backpack