The cooler is rarely the problem. The way you pack it is. I learned this the hard way on a beach trip where the ice was gone by noon and the sandwiches were warm and vaguely damp by one.

Same cooler, better packing, and now my ice survives a full day in the sun.

Chill everything first

Never put warm drinks in a cold cooler. Every warm can you toss in is ice you are sacrificing. The night before, put the drinks and any food you can in the fridge.

• Pre-chill drinks and food overnight
• Freeze water bottles to use as ice blocks
• Keep the cooler itself in a cool spot, not the hot garage

Frozen water bottles are my favorite trick. They do the job of ice, and when they melt you have cold water to drink instead of a puddle of mystery cooler soup.

Layer it right

Dump ice, then food, then more ice does not work as well as people think. The goal is to keep cold air down and warm air out.

• Line the bottom with a solid layer of ice
• Pack food and drinks tight with ice around them
• Fill every gap, then top with a final ice layer

Air is the enemy. Empty space warms up fast. If you do not have enough ice to fill the cooler, add a folded towel on top to fill the gap and insulate.