Start your layers with block ice down at the bottom of your cooler. Then add any frozen goods and the goods you need to keep very cold, like raw meat. Now pour a layer of ice cubes over everything, making sure that they are packed into every crevice. You want to leave as little empty space behind.

To maximize cooling efficiency in a soft-sided cooler bag, you should place the majority of your ice or ice packs at the bottom and on top of your items. Because cold air is denser than warm air, it naturally sinks; having ice at the top ensures that the cold air flows down through your food and drinks, creating a "convection" effect. In 2026, experts recommend a "layering" technique: start with a base layer of ice packs, add heavy drinks and perishables in the middle, and finish with a generous layer of ice on top. If you are using loose ice cubes, consider placing them in sealed Ziploc bags to prevent the "soggy sandwich" effect as they melt. For the best results, always pre-chill your cooler bag in the freezer or with "sacrificial" ice for 30 minutes before packing your actual trip supplies, as this prevents the insulation from immediately melting your primary ice source.