Karrimor Hydration Bladder The Karrimor Hydration Bladder is a great accessory for walking, cycling and a mulitude of other outdoor activites. The bladder will fit almost any hydration compatible rucksacks or hydration pack; great for upgrading your back pack or replacing an aging drinks bladder. Constructed from hygenicTPU material. This hydration bladder has a large screw cap for easy filling and cleaning. The bite valve also features a dust cover to keep the valve clean. Product code: 787045