The IcyBlock is a great addition to any cooler. The IcyBlock is used in conjunction with ice often times doubling the life of the ice. Simply fill with 1 gallon of tap water or salt water then freeze and add to the IcyBreeze to help chill the water that acts as a cooling agent. The IcyBlock is reusable and stackable.  As many as three IcyBlocks will fit inside an IcyBreeze.