The professional water bladder with 135 degree ergonomic angle bite mouthpiece,capable for your backpack during outdoor activities.Drinking the water by the tube directly without taking your running vest off or stopping your steps.Suitable for riding, running and mountaineering etc. Features: Made of premium food grade PEVA and silicone material,safe and taste free. 135 degree ergonomic angle bite mouthpiece and high flow PEVA water tube,just need less angle to put mouthpiece into your mouth and drink higher water flow per sip. The bite mouthpiece has ON/OFF valve,simply pull valve up for drinking and push it down for closing. Large and wide opening mouth makes filling/refilling water quickly and cleaning easily for every corner. Double sealing edge and sealing clamp,make sure the pressure tolerant and leak proof features. Optimum Temperature is from -20 to 50,portable to store hot/cold water during outdoors activities. Suitable for riding,running,cycling,backpacking,camping,hiking,mountaineering etc. Specification: Capacity: 1.5L / 2L (optional) Material: PEVA + Silicone + Plastic 1.5L size: 31 * 17.5 cm / 14.4 * 6.9 in (unfill water) 2L size: 36.5 * 17.5 cm / 12.2 * 6.9 in (unfill water) Tube length: 102 cm / 40.2 in Optimum Temperature: -20 to 50 Weight: approx. 120 - 140 g / 4.2 - 4.9 oz Package List: 1* Water Bladder