Cooling Vest Self-Contained Operation Affords the user freedom of movemenst Dual Role as a Hydration system Affords the user the benefit of drinking ice cold water Long Cooling Charge 3-4 hours 1 5kgs Cooling medium 5-6 hours 3 kgs Cooling medium Quick cooling recharge Pre-frozen pouches of cooling medium can be placed in backpack in just seconds Spare re-chargeable batteries will keep your system operating for several hours Easy to replace the battery and cooling pouch Light weight Construction 4 lbs dry and 8 lbs fully load Small size system pack Back pack Waaret pack Fire Resaretant Material are available