This test was conducted by putting 13 ice cubes (6.6 oz of ice) in each mug and closing the lids and leaving the mugs at room temperature (approximately 68° F). After 26 hours, the water was drained off and the ice weighed. (click on the thumbnail above for the results of our test).
In addition, it features a silicone sealed leakproof contained twist cap that keeps your lips away from plastic contact, resulting in a better drinking experience. The 16 ounce Commuter Mug is perfect for your home roasted coffee, as well as ice cold beverages, and of course, beer. Make your commute a little better, and keep something cold a long time for the weekend as well.
8½" tall, 2¾" wide (fits in all car cup holders).
Jul 16, 2018 by Scott
Q: The description does not make sense - why would there be copper between the walls? Copper is a heat conductor. Normally there would be a vacuum like a thermos bottle to prevent heat transfer.....
A: From the manufacturer: "Made of double-wall stainless steel with copper vacuum insulation." We are not sure of the exact science behind this, but we know the mug works well.
Jul 14, 2018 by Todd
Q: How many ounces does it hold?
A: 16 oz.
Jul 14, 2018 by James
Q: Does it fit in a keurig brewer?
A: It is 8.5" tall, so it depends on the brewer. On the Keurig we have here, it is too tall.
Jul 14, 2018 by Rudy
Q: Can you drink out of the mug without completely removing the lid?
A: Yes, just turn the lid 180 degrees to open it and you can drink from any part of the rim.
May 19, 2018 by Rick
Q: Dishwasher safe?
A: The stainless mug is, the plastic silicone sealed lid is not.
Great Commuter Mug
Works well for both hot and cold beverages. The twist lid is easy to use and doesn't leak
Keeps coffee hot for a long time. I really like the size - easily fits in my cup holder in all my vehicles
Excellent, with a caveat about cold beverages
While too tall to fit under my coffee maker, I am amazed how long it keeps my coffee hot without needing to be completely sealed while I am not actively drinking it. One issue I had on the first day I used it was when I rinsed the coffee out and filled it with ice water. I screwed the lid snug and it created a vacuum preventing me, or any of my coworkers, from being able to open it until it eventually warmed. I now am more careful how tightly I seal it with cold liquid inside.
Williams Commuter Mug
Has kept my coffee hot of rat least 6 hours. Has kept coffee warm for 24 hours. Lid does not leak. I can find absolutely no problems with this mug.
Williams travel mug
I've been using this mug on warm days to keep my beer cold. It stays colder longer than sipping' out of a bottle or can. I know it would keep coffee hot, but what's more important? Thank you, Brewdog333