Hydration Water Bladder material: EVA or TPU Capacity: 1.0L, 1.5L, 2.0L, 3.0L Hydration Water Bladder material: EVA or TPUCapacity: 1.0L, 1.5L, 2.0L, 3.0Lcold-proof and freezing resistance; meets FDA and EU standard, BPA FreeVarious kinds of body designs(inside or outside mouth) are available.Customer's designs are welcome, too.