Review on Smoke Stainless King Thermos Travel Tumbler, 16oz - Vacuum-Insulated by Daniel Drury

Incredibly well designed. This keeps my tea at the same temperature throughout the day and it doesn't leak at all, the two most important features of a thermos. Also, the cap unscrews easily (no fumbling to set the threads) and the open-close mechanism is easy to use and has a very nice click. The narrow base fits in cup holders and the thin strip on top is perfect for my small hands. It's finally easy and convenient to drink from! I've had another Thermos brand thermos (with a smoother, more curved look) that has tested many of these boxes, but this one makes things just that little bit better. In particular, this is an improvement in the opening-closing mechanism, a drinking sponge and making it easier to twist the lid. A NOTICE. The first one I got from Revain didn't work properly. I used it for a few days and then compared the heat retention performance to my friend's same model. The liquid in mine was lukewarm after a few hours. Something is wrong with the vacuum seal. I sent it in for a replacement and the new one works perfectly. If the outside of the thermos is warm a few minutes after the hot liquid has been poured in, the thermos is defective. SEND FOR A REPLACEMENT.