BUILT NY Gourmet Bento Slim Lunch Ice Pack, Set of 4 This set of a four ice packs are great for all types of lunch totes, bags and boxes Perfect for everyday use, just freeze each ice pack overnight With a unique nesting design, these ice packs save space in your freezer and your lunch bag Each ice pack measures approximetly 6.0" x 4.5" x 0.5" Ice packs are non-toxic and BPA Free; hand wash only