These cool blue Ice Packs are the perfect solution to keep your school or work lunches chilled when you don't have access to a fridge. Slim enough to fit into any lunch bag or cooler with a nesting design to keep them organized while stored. For best results, freeze overnight before use. Made from BPA-free, food-safe polypropylene. Hand wash is recommended. Each ice pack is 6 inches long x 4.5 inches wide x .65 inches high. Stacked set measures 6 inches long x 4.5 inches wide x 2.2 inches high.