Our top picks are from Yeti and Cooler Shock. Cooler Shock makes the best ice packs for coolers—they kept drinks cold for nearly 48 hours. We also liked the Yeti Ice as a durable pick. Ice packs ...
Here is a simple recipe for an effective and inexpensive ice pack. Mix three parts water with one part rubbing alcohol. Put the solution in a plastic bag and double it after squeezing all the air out.
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