If you’ve ever had a stainless steel tumbler that developed rust spots after 6 months, or noticed a metallic taste in your morning coffee that wasn’t there the first month, you already know why not all stainless steel is created equal. After testing 8 different “premium” tumblers over 5 months, here’s what 316 marine-grade stainless actually does for a daily coffee or water tumbler, and whether it’s worth the premium price.
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