I purchased two of these cups for camping but I like them so much I use one daily. Unlike other thermos-type cups, this one actually keeps the beverage hot for quite some time, especially if you place the cap on it. The cap itself is really unique in the way it works. After filling with a hot liquid the cap fits rather loosely in place. But, after a few seconds heat expands it and it wedges itself in place very securely. You can still pry it off but not easily when it's hot which is just what you'd want. Also, that cap has a neat little sliding anti-splash tab on the top that actually works.