This is excellent travel mug, buy you need to make sure that you wait few minutes before you will close it as it can leak otherwise. I use it every day during cold months to take warm tea to work. It keeps your drink warm for a long time. I can recommend it without any doubts. Try it and you won't change it for anything else.
They don't leak, and stay cold or hot all day! I've had mine for about 5 years now and will forever stick with this brand. They're way cheaper than the famous brands, and work just as well if not better.