If you haven't had any other thermos before, you believe that it keeps the temperature. But it is mediocre to useless. I wouldn't choose it again.

After many tests on thermoses, this is the best one. It doesn't sweat, it keeps my coffee cold throughout the workday (10 hours, including commuting and summer!). It doesn't leak from anywhere, although I don't constantly turn it upside down. Once it accidentally fell, but not a drop spilled! I don't put it in a cup holder, so I don't care if it fits. Besides, it states the dimensions. Before you buy it, read to see if it suits you. The straw is great, it even has a brush for easy cleaning. It's definitely worth its money. I definitely recommend it!!