PUZZLE SHAPED - Set includes 6 unique puzzle shaped ice packs measuring 5.25"x.5"x5.25". Kids can use multiple to build fun shapes or one at a time. Fun either way and lunches stay cold all school day! Freeze ice blocks overnight for best results. FREEZE & INTERLOCK - Keep your lunchbox cool from all sides with interlocking ice packs. For maximum coldness, simply snap the shapes together to make a 3D ice cube around your milk and yogurt or lay cold pack flat on top and bottom of lunch box. FUN FOR KIDS & KIDS AT HEART - Brighten up lunch with colorful puzzle ice packs for lunch boxes! Slide between snacks to keep everything cold for hours. Our kids ice packs fit snuggly in standard sized kid lunch boxes. The perfect bento box ice pack! SAFE & NON-TOXIC - Built with BPA-free and non-toxic materials, our slim ice packs are safe to pack with food and easy to clean. Simply rise with water. With a durable leak-proof design, these lunch box ice packs are sure to survive the school year! DESIGNED BY PARENTS FOR KIDS - Cool Coolers brand is the most trusted reusable ice brand for its groundbreaking line of flat ice packs! Available in multiple sizes, colors, and shapes, these freezer packs for lunch boxes are kid tested, mom approved!