YETI is known for its coolers, and, as noted, the company calls the Rambler Tumblers “personal drink coolers.” They are made of 18/8 stainless steel with vacuum-insulated walls that regulate ambient liquid temp inside. The BPA-free plastic lid snaps onto the top of the 20oz or 30oz version of the cup.These cups and bottles are designed to withstand extreme temperatures and circumstances. The yeti family is tough and will keep your drinks as cold (or as hot) as science allows
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