Keep food fresh for longer with these Interlocking Freezer Blocks Choose from a pack of 6, 12, 18, 24, 30 or 36  Slim and interlockable  Build freezer boxes and make cubes  Pop into your lunch box, cooler bag and backpack Wide base and quick freeze gel maximises cooling capacity  Reusable and durable Perfect for cooling food and drinks, storing medications, camping and picnics Use as a portable air conditioner when you're stuck on the tube Keep your shopping cool on the way home with these Interlocking Freezer Blocks - save 86%