This Hi-Performance Pak is non-toxic, non-hazardous, and re-usable and outperforms standard gel packs. The Engel Cooler Pak makes for a great cooler companion to keep contents cold and dry. Works great in lunch boxes, beach coolers, soft sided coolers and cold shipping. It also works well to extend the life of traditional bagged ice. Enjoy your recreational sports without the mess of melted ice.