45L Tactical Backpack,Gonex 900D Oxford Assault Pack Travel Trekking Military Backpack BACK CUSHION DESIGN: 3.0cm encrypted elastic sponge back cushion. According to the human body engineering, the load is effectively decomposed to the waist, which reduces the weight backpack pressure on the spine. DURABLE: Durable Crafted from water resistant and tear resistant 900D waterproof oxford, durable construction. You dont need to worry about that your bag will be splashed wet, or be punctured by the sharp things. CARRYING SYSTEM: Padded and breathable mesh back panel and shoulder straps offer cushioning comfort, while also promoting air circulation along your back and shoulders. MOLLE SYSTEM: MOLLE external expansion system designed to be used in combination with other equipment, you can load pockets, water bottle bag, accessory kits or something else conveniently, which makes your journey as you like. Large capacity: the front of the backpack has the room which can be folded, and can contract it back by buckling fastener up, thus, it is convenient to load more items when you go out.