40L Backpack1) it has a main pocket, Two front zipper pockets, one front mesh pocket and two side mesh pockets and waiest pocket to keep your things organized and organized,and makes it great for 2-4 day adventures.2) Lightweight: only 0.7 kg(1.54 pound), which helps you reduce the extra burden.3) Waterproof nylon: Made of durable and waterproof nylon fabric, providing strength and long-lasting performance.4) Special design: The lifeguard whistle design on the chest adds points to your outdoor safety, Reverse cursors are designed on the front pocket of the backpack increase the safety of night travel5)Unisex, suitable for many occasions, such as hiking, camping, spring outing, traveling, mountaineering.''