Waterproof Riding Cycling Bike Bag Hiking Camping Backpack Capacity: 30L. Adjustable carrying system makes it possible for users to adjust the backpack to optimal position and reduce fatigue owing to heavy load effectively. It is 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. Size :45 * 24 * 12cm/17.7 * 9.4 * 4.7"(Height *Width * Depth) Enhanced back support for ventilation and comfort.Can be used for Camping, Hiking traveling Bag