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The Mainstays 20 oz Stainless Steel Tumbler is a double-wall vacuum-insulated cup with a straw lid and a side handle. It holds 20 ounces, fits most car cupholders, and the four-way threaded lid lets you set the straw to either hand. It is a budget pick aimed at commuters, students and desk workers who want a handled tumbler without paying premium-brand money. Against rivals like the Stanley Quencher or Yeti Rambler, it gives up capacity and some lid refinement but covers the basics: insulation, a handle and cupholder fit. Owners rate it well overall, with most complaints about lid sealing and long-term ice retention.
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Lowest price we've seen: $11.99 on Nov 12 at Amazon. Tracked across 1 store since Nov 12.
Owners rate the tumbler 4.3 out of 5 across more than 1,200 ratings. Most praise its insulation, handle and cupholder fit for the money. Complaints center on the lid leaking when tipped and ice not lasting as long as expected.
This Mainstays tumbler is a 20 oz stainless steel cup for drinks on the go. It has double-wall vacuum insulation to help keep hot or cold beverages at the right temperature for hours. The finish is black.
An ergonomic handle gives a comfortable hold. The shape fits in a cupholder, so it can go along in the car or while traveling. The four-way threaded straw lid lets you adjust the straw position to suit your drinking hand.
