Bring your drink with you everywhere you go. When worn like a back-pack, the clip on the strap of this unique drinking system, secures the tube in an upright position for handsfree drinking. Biting and sucking the mouthpiece controls the liquid flow. Attaches to wheelchairs or headboards for easy access. The insulated container holds up to 75 fl. oz. (2.2 litres) and keeps the contents hot or cold for up to four hours. Made of rugged, plastic insulate, polyurethane foam. Replacement valves can be purchased separately.