So I experimented with extending the life of ice over a Selway trip 2 weeks ago. It was not very scientific but the visual results were impressive. I should have weighed the blocks pre and post trip. After 7 days in the cooler the wrapped ice' were 2 1/2-3 times the size of the unwrapped ice. This cooler was accessed for Beer and food throughout the days (poor cooler maintenance), with no wet towel or cover. I didn't necessarily need it on this trip but I can see its use on extended trips like the GC.
Having a couple unwrapped for the first week+ then unwrap the others.
I have about $5 into materials but had the butyl tape. They are reusable and can be cut open and resealed a couple times.
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