Tinypony Comfortable Waterproof Assault Pack Military Rucksacks Tactical Molle Backpack Camping Hiking Trekking Sport Outdoor Bag Tactical Backpack Molle Bag 3P Adjustable carrying system makes it possible for users to adjust the backpack to optimal position and reduce fatigue owing to heavy load effectively. The waist belts which can disperse the load to the lumbar area more effectively. Propitious to breathe. Enhanced back support for ventilation and comfort Chest belts can adjust distance between the two shoulder straps and strengthen the stability of the backpack.