[ Tactical Hydration Backpack ] The hiking water storage bag has 5 colors for you to choose from: Coyote Brown, Multi-color Camouflage, Multi-color Camouflage Black, Black, Green. Packing size: 11 x 6.3 x 3.6 inches (L x W x H), compatible with most water bags, and equipped with 2 tube openings on the top of the hydration backpack, allowing you to replenish water at any time. It will become an outdoor accessory for hiking, cycling, mountaineering, running and other outdoor sports. [ Hydration Bag ] It is very important to stay hydrated during sports or outdoor activities. This hydration bag can accommodate a 2-liter water tank. In addition, this water backpack has a large main pocket, a small pocket and 2 front pockets, which are enough to store your phone, wallet, keys, knife, multi-tool or anything else you need. [Molle Webbing and Shoulder Straps ] This hydration backpack has MOLLE webbing on the back and bottom for connecting accessories and gear, and two adjustable quick-snap shoulder straps on the back that can be connected to any MOLLE webbing system. Besides, the running hydration backpack has quick release buckles, smooth YKK zippers and hook and loop on the front, which is very convenient to use. [500D Material Hydration Backpack] Molle hydration backpack is made of 500D nylon material, which is highly durable, abrasion-resistant, waterproof and quick-drying fabric. The hydration bag for 2L water bag has nylon webbing handles, YKK rope zippers, sturdy and durable buckles, Velcro panels, suitable for hiking, running or mountaineering. [Multi-purpose hydration backpack] The hiking backpack is suitable for hiking, running, mountain biking, cycling, mountaineering, music carnival and other outdoor occasions.