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This tumbler keeps my coffee hot for hours during my morning commute, and I love that the copper coating really seems to help with the insulation. The double-wall vacuum seal is exactly what I needed.

I’ve been using this tumbler for a couple of weeks now, and the vacuum insulation is no joke—my coffee stayed warm for a solid three hours on a chilly morning. The copper layer on the outside gives it a nice grip, though I wish the lid snapped on a bit tighter for tossing in a bag.

Copper coated layer does seem to do its job—my drink stayed warm for a few hours, though not quite all day. Handle feels sturdy enough, but the lid could seal a bit tighter. It's a decent tumbler for the price, just not the miracle worker some might expect.