This military backpack is made of 600D waterproof polyester. YKK zipper. Water Replenishment Compartment-This assault backpack is equipped with a kettle compartment, which can hold a 5 liter water bag. The tube passes through the top of the bag and is close to the grip handle. MOLLE WEBBING-You can hang tools, trekking poles, tents, sleeping bags and other accessories to use molle design. The rifle can also be hung on the side straps and side pockets. Side pockets for quick use-This hiking backpack is equipped with 2 side pockets (8 inches * 8 inches) and 2 larger pockets (7.5 inches * 13.7 inches), which can hold water bottles or camping and survival gear. There is a large zipper on the front of the backpack, allowing quick access to the main compartment and opening as a 15.6-inch (approximately 39.6 cm) luggage. Durable & versatile-this molle backpack is equipped with a chest strap to cope with the weight, so it is well used as a 3-day assault bag, survival backpack, army backpack, hiking backpack or day backpack. It is suitable for trekking, trekking, camping, mountaineering, and traveling.