You can customize the shape of the insulation boxHow to Keep Your Ice From Melting So Quickly in Your Cooler:1. Line the Inside of Your Cooler With Aluminum Foil.2. Choose the Right Type of Cooler for Your Activity.3. Pre-Chill Your Cooler and the Items You're Going to Store in It.4. Use Larger Ice Blocks, as Opposed to Cubed Ice.5. Wrap Your Cooler in a Wet Towel. 6. Organize Your Cooler.7. Use Dry Ice as Well as Regular Ice.