5 Rules for Keeping a Cooler Cold All Day

Pre-chill everything before packing Warm drinks and food act as heat bombs that melt ice faster. Put drinks, food, and even the cooler itself in the fridge overnight before packing.

Layer ice like a lasagna Start with a thick base of ice, then add food, then top with more ice. Cold air sinks, so the bottom stays cold naturally, while the top layer of ice shields against heat from opening the lid.

Pack it tight and eliminate air gaps Air pockets let warm air circulate and speed up melting. Fill every space with ice or items to keep cold air from escaping.

Keep dry items separate from melted ice Cold water holds cold better than air, but it will soak your sandwiches. Use a separate dry bag for anything you don’t want swimming.

Use the right cooler for your trip Rotomolded coolers are worth it for camping trips. For a day trip, a cheap cooler works fine if you pre-chill and pack dense.