Thermos Nissan 14-Ounce Leak-Proof Travel Mug, Smoke

I have four of these mugs.

Pros:
- Keeps coffee hot for a very long time when sealed.
- Doesn't leak.
- Durable.
- Carabiner makes it easy to clip onto backpack.

Cons:
- A little inconvenient to clean.
- Nissan unresponsive about replacement parts.

Tips:
Make sure the lid is screwed down snugly, but not too tightly. You want to form a complete seal to prevent leaks and retain heat, but the seal gets tighter as the contents cool and shrink.

Don't fill past the raised metal fill-line on the inside of the mug. If you overfill the mug, some liquid will be pushed up into the threads when you screw the lid down, and you won't notice until you tip the mug. (It's easier to see the line if you fill it beneath an overhead light.) If you think your mug leaks, you've probably overfilled it.

If you fill it just right, you don't even have to stir your coffee. Just add your sugar, cream,...Read more

A key fact about this insulated mug--and all similar--for the curious: they are not stainless because it looks cool. The stainless that counts is on the inside, as this is what provides *far superior insulation* of hot or cold beverages than the standard glass vacuum bottles.

I've been drinking from one of these for years. A few months ago I lost mine and replaced it with one we had lying around that was plastic on the inside instead of stainless--I knew this one would not keep my coffee as hot, but I thought perhaps I'd gone overboard and could get by without replacing my Nissan Stainless mug. After a few months, I recalled the lesson I'd learned about these mugs years ago: because they keep the coffee so hot, for such a long time, YOU DRINK LESS COFFEE. It sounds kooky, but I've been overwhelmed by this discovery twice in the last decade. (Here's how: consider that when you take a sip of coffee, you get the smell, the strong flavor, the steam on your nose, and the hot beverage...Read more

Thermos is the Japanese company. I have been using their product since 15 years ago. When I found this mug available in USA, I purchased one for my husband as he will take a cup of coffee to enjoy it during traffic jam. He likes the tight lock of this mug. No more spill! He also like the temperature of the coffee. The insulated wall really works!
The first month after using this mug, we found the lid could be separated into 3 parts: The top, the container shaped bottom, and a rubber band. It was very yucky first time we dis-assembled the lid since coffee and cream can get into it through the seam. Ever since, we dis-assemble the lid every time we wash the mug. A little hassle, but for the nice & hot coffee, it can be tolerated!