The Nu-Ice ice packs provide hi-Performance pak is non-toxic, non-hazardous, re-usable and outperforms standard gel packs. The Ultimate Cooler Pak makes for a great cooler companion to keep contents cold and dry. It is perfect for lunch boxes, beach coolers, soft sided coolers and cold shipping. It also works well to extend the life of traditional bagged ice. The Marine Series meets the demands of the Sport Fisherman and weekend boater.The Marine Pak is an excellent alternative to turn your cooler into a chest freezer.