Model: COMP-BPIC-7430-FC-FBBK The Compcooler Backpack Full Body ICE Water Cooling System combines a tubing-lined full body garment with a liquid cooling system housed in a backpack to form a self-contained and convenient thermal regulation device. The garment is made with a breathable and stretchable material that weighs a mere 1.0KG (2.2 lbs.), dry weight. Available in sizes XS/S, M/L, L/2XL, 3XL/4XL, the garment cools four zones including the torso, arms, legs and head. It's easy to don and comfortable to wear against the body. The liquid cooling system is contained in a backpack that weighs 1.5KG (3.3 lbs.), dry weight. It includes a 3.0-liter removable water bladder, miniature circulation pump, 7.4V 2200mAh rechargeable battery, and On/Off switch. When operating, it's audible output is 48dBA. Cooling energy is provided by removing the bladder from the system, filling it with water and placing it in a freezer. Once frozen, the bladder is easily re-attached to the system, and with a charged battery pack, Users turn the switch ‘On' and the pump circulates cold water in a continuous loop between the bladder and garment. Depending on ambient temperatures and workload, Users can expect a cooling duration anywhere from 2 to 4 hours with a fully frozen bladder or 1 to 3 hours using ice cubes in the bladder. The battery can last up to 10 hours. Additional bladders and battery packs can be purchased for prolonged cooling.