TPU Hydration bladders/water bladdersTPU Hydration bladders/water bladders:food grade material,environmental friendly .1.5L 2.0 TPU Hydration Replacement Reservoir 1.Material: TPU/EVA.food grade material meet SGS and FDA.2.SIZE:1.5L 2.0L 3.0L optional3.COLOUR:any colour avaiable4.Features: Waterproof,steady and good quality control and no leaking, easily use and hand free,big mouth/small mouth