There are two control subjects in this test group: An un-insulated stainless steel klean kanteen, a YETI Rambler Insulated Tumbler with an even larger non-sealing lid than the wide-mouth bottle.Īs expected, the bottle with no insulation tracks very close to ambient temperature after just two hours. The peak outdoor temperature was 94 degrees Fahrenheit, and the bottles were all in the sun for about an hour. We measured the temperature of the water over the course of 40 hours. If you’re actually trying to keep a drink cold for 24 hours, pack in as much non-melted ice as you can. We let the ice melt, since it soaks up extra heat when it melts, and it’s hard to ensure there isn’t more of that thermal capacity going into one bottle or another. We filled a large stockpot with water and dumped in about 4 pounds of ice from a handy portable ice maker. It’s also preferred by some of our testers because they feel it’s easier to drink from. We also tested the less-well-known narrow-neck Klean Kanteen bottle, which performs better in insulation tests because of the smaller opening letting less heat in or out. YETI is still very well-known for their insulated tumbler, but we put their newer insulated Rambler water bottle and the popular Hydro Flask through their paces to see which of these brands really puts more into their insulation engineering. We’ve been testing water bottles, travel mugs, and other beverage containers for four years, and the comparison people are always asking about is YETI vs.
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