Including one that keeps ice frozen for four days straight.
The first thing to understand about coolers is that their name is deceptive. Coolers don’t cool so much as maintain already cold temperatures over variable periods, which is why you’ll ideally want to fill them with ice or reusable ice packs, plus food that’s already cold or frozen. Coolers with a strong seal and advanced insulation will keep that ice frozen for longer — sometimes even days at a time.
Dr. Rebecca Webb, an instructor of energy systems engineering at the University of Southern Oregon, explains that coolers become heavier as insulation gets thicker, while also losing storage capacity: “So it’s a bit of a game for cooler manufacturers — they’re striving for something that’s light and has plenty of volume but also keeps the food cold.
Common sense will enhance the insulating qualities of any cooler, even a Yeti. “Don’t open it a lot,” says Webb. “And if you leave the cooler in the sun, it’s going to absorb more heat than in the shade.
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