How long does it keep drinks cold?

Stanley rates the double-wall vacuum insulation for hours of cold; owners commonly report ice lasting most of a workday.

No. The lid and straw are designed for sipping, not for sealing in a bag. It can leak if tipped over.

Does it fit in a car cup holder?

The tapered base fits most standard car cup holders, though very small or shallow holders may not take it.

The tumbler body is dishwasher safe. Stanley recommends hand washing the lid and straw to protect the seals.

The 40 oz holds more and still fits most cup holders, but it is taller and heavier. The 30 oz suits smaller hands and lighter carrying.

The tumbler with its FlowState lid and a reusable straw.

Rated 4.4 out of 5 from 93,000 ratings.

11 stores we checked sell it, including Pottery Barn Teen, Bloomingdale's, DICK'S Sporting Goods, eBay, Sierra.

At Mercari, for $19.28, 45% under what the other stores charge, as of our latest check.

$19.28at MercariChecked Oct 31

45% under what the other stores charge

Compared across 12 stores. Prices are checked against each store and labelled with when.