This is great for brewing tea on the go, except for the fact that it is made of glass. I don’t bring it everywhere because I’m afraid to break it, but it’s useful to keep in your office. I have the one with a bamboo lid and this part of the mug is poorly made. When I bought it, there were little cracks in the bamboo. I went back to the store and I found out that they were all like this. I could have got a refund, but I decided to keep it because it was useful. I just avoid to put the lid on when I have tea in the mug to keep the bamboo from cracking more. It defeats the purpose of a travel mug, but as I said I don’t really use it for this. It’s very expensive for the quality. I’ve had mine for more than a year so maybe they fixed the issue.