Canyon Cooler High Performance hard pack
Cooler Shock is a food-safe, non-hazardous ice alternative that gets your food and drinks colder faster. It's an excellent choice for shorter trips, or in combination with ice to maximize cold. The chemical composition of Cooler Shock is designed to phase change (go from solid to liquid) at 18 degrees as opposed to 31-32 degrees for ice.
Cooler Shock Hard Pack is the same great forumla, in an engineered plastic shell to maintain shape. Add 7 cups of water and it becomes 5lbs, but replaces 7lbs of ice.