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I’ve been using this for my morning coffee and it stays hot for hours — the insulation is seriously impressive.

Filled it with ice water before bed and there was still ice rattling around the next afternoon. The insulated walls really do their job, and it hasn't leaked in my bag once.

Took this on a hike in 90-degree heat and the ice was still rattling around six hours later. The insulated walls are thicker than my old tumbler, and it hasn't leaked once in my bag.