A pack includes a 2L water bladder and a neckpiece -2L, ultimate remedy against dehydration -Easy and fast-flow silicone bite valve, easy refilling screw cap (8 CM diameter cap) -PVS and Bisphenol-A free, EVA material Specification: Band: AXEN Material: EVA Color: green Capacity: 2L Size: as picture showed Application: hiking/cycling/climbing/camping Recommended water temperature: -20℃ to 50℃/-4°F to 122°F Package: PE bag/set