Cryopak Flexible Ice Pack for Lunch Boxes (2 pack) Pack of two reusable flexible ice blankets measuring 4.5 x 8.8 inches. Perfect size for lunch boxes and coolers. Maintains cold temperature for 24 hours in an insulated container, and can be cut to size thanks to its unique seam technology Non-toxic liquid makes blanket ideal for coolers, first aid kits, and even lunch boxes; ideal to help relieve muscle pain and swelling Patented design allows blanket to be flexible when frozen, so you can wrap it around various shapes and sizes.