This hi-performance AO Ice Enhancer packs are non-toxic, non-hazardous, re-usable and outperforms other gel packs. The AO Ice Enhancers make 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. These packs are safe, friendly and re-usable.