Flexible TPU constructed,BPA free for safe use during outdoor running, hiking, marathon, cycling and climbing. Features: Made of premium food grade TPU material.Reusable,BPA-free and safe to use. Soft bite mouthpiece into your mouth and easily drink water flow per sip. A dust cover helps to keep the mouth piece of the water reservoir clean. Leakproof sealing edge makes sure the pressure tolerant and leak proof features. Optimum Temperature is from -20 to 50,portable to store hot/cold water during outdoors activities. Can be folded into a very small size,and placed in your backpack. Suitable for riding,running,cycling,camping,hiking,mountaineering,outing or excursions etc. Specification: Capacity: 250ml / 500ml / 300ml / 380ml (optional) 250ml size: 240 * 75 mm / 9.4 * 2.9in 300ml size:170 * 75 mm / 6.7 * 3.5 in 380ml size: 210 * 75 mm / 8.3 * 3.7 in 500ml size: 255 * 75 mm / 10 * 3.7 in Material: TPU + Silicone + PP Optimum Temperature: -20 - 50 Weight: Approx.27.7 - 33 g / 1.0 - 1.2 oz Package size: 31 * 12 * 4cm / 22 * 10 * 4cm Package weight: Approx. 30 - 38g / 1.1 - 1.3 oz Package List: 1* Soft Water Bottle 1* Straw