The DOMETIC Cool-Ice passive coolers offer a key benefit–they require no power supply. Instead, they are rotomoulded to be lightweight and easy to handle with a highly effective polyurethane foam insulation, combined with a tight closing labyrinth seal. Once the cool packs or ice cubes have been placed inside, they will keep groceries, drinks, fish, bait and wild game fresh, even for several days at a time depending on use and weather conditions.