Features: 1.Can be used with water bag backpack, good sealing performance. With gaskets inside the cover to prevent water leakage, no leaking with squeeze. 2.With dust cover to protect the suction nozzle clean. Applicable to drinking water at room temperature, can not be filled with beverages and hot water, can relieve the water in the tube will not freeze under low temperature conditions. Or in the high temperature state, the water bag will flavour reversion for a long time lighting. 3.The bag made of qualirt TPU material, elastic, flexible, safew, durable. Quick release insulation tube, the bag does not leak when separated, convenient for filling, cleaning and storage. The pipe is covered with insulating waterproof neoprene casing to prevent the water in the pipe from freezing in the winter, and prevent from overheating in the summer to keep the water fresh and cool. 4.360 rotatable soft bite valve, easy to drink water. The on-off valve controls the opening and closing of the water flow and does not drip when the valve is closed. The tube head is detachable for cleaning. The pure silicone nozzle allows the water to flow quickly, you can take in the water with a single bite. 5.Large opening for easy filling, easy to clean, dry, add ice. The center baffle helps to limit water sloshing and keep the water bladder flat, fit easily into the backpack. 6.Suitable for outdoor activities, such as climbing, cycling, etc. Specifications: Item type: Water Bladder Material: TPU(bag body), TPU(drinking tube), silicone(suction nozzle) Color: coffee Options: 2.0L, 2.5L, 3L 2.0L bag size(width x length): Approx. 208x340mm/8.2x13.4in 2.5L bag size(width x length): Approx. 208x385mm/8.2x15.2in 3L bag size(width x length): Approx. 208x445mm/8.2x17.5in Thickness: Approx. 0.4mm/0.02in Drinking tube length: Approx. 100cm/39.3in(included suction nozzle) Packing List: 1 x Water Bladder