Cryopak Reusable Hard Shell Ice Pack is perfect for any lunch box, bag or cooler. It's filled with Cryopak's patented, super-absorbent polymer, which outlasts traditional water-filled ice packs. The hard shell makes it extremely durable, so you can carry it in a soft bag without worrying about breaking it. Also works well as a cold compress for sports wraps or first-aid use. BPA-free and non-toxic.