Stick your food pouch into the Thermal Pouch, pour in your hot water & your meal will stay warm for 25% longer. You can even cook up your food in a pot & then slip the pot into the Heat Pouch to keep it insulated. The pouch features handwarmer slots on the side so that in freezing weather you can use the heat from the food to keep your hands warm, & hold your dinner without getting burnt. With minimal weight & a compact size its one piece of luxury that you can afford to pack.