PBC Ice Packs are flexible when frozen and can be cut to fit if needed. They can be flat packed and activated at your destination making them easy to travel with. They work as well as ice but will not melt. We recommend: 1 sheet per 6-can cooler, 2 sheets per 12-can cooler, 3 sheets per 24-can cooler and 4 sheets per 48-can cooler.