I know I’m rehashing an old discussion found somewhere elsewhere here...but I can’t remember where or what the answer is.But your ice will disappear faster, no free lunch.
Bonus for circulating the medium as well, whether it's air or fluid
Have you tried putting ice in it ie frozen milk jug? You might drop down in temp and the ice might last several days before actually melting.I hated ice, one garage sale I saw a Kooltron Cooler, $10. I bought it. On summer trips 90 degree days, it holds everything at 42 degrees for a week. Cheaper than ice for a weekend. I know, 42 is not food safe but we are talking about keeping milk cold for a few days, cold cuts, veggies for a week. It works. Hope the fear mongers park it.
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not really I have an ARB50 and I still like to have ice in my whisky and cokes or Manhattans or margaritas. I throw in a half of bag of ice and it does not melt and make everything wet but stays in cube form for several days and the arb does not have to pull much power to stay frosty cold. I would think that one bag of ice in your cooler would drop the temps down low enough to keep food safe and not melt at a very fast rate.sort of misses the point of buying a plug in cooler
I have a knock-off version. It does better than my old coleman but it doesn't do as advertised. Brand is nICEWhat kind of cooler do you have? If it's a Yeti, RTIC, or similar, you "should" last that long.
Make sure to keep it full, leave the melted water in it, keep it in the shade with ventilation if it's hot (not in the car), open as little and as quick as possible. If you are adding bottled water or anything that can be frozen, freeze them. If you're going to be by the water (lake), a wet towel on it will help too. Lining the inside of the cooler with foam or reflectix insulation can assist as well. Make sure the lid seals tightly.
If you have the space and means to get a second cooler(even borrowed) fill it with ice, duct tape it shut, and only open towards the back end of your trip.