Have bought me the cup, because I need a sealable cup to get to work. The cup holds great warm (after 20 minutes walk almost too hot to drink) and through the lockable closure I can be sure that nothing runs. Prima! The disadvantage I noticed that the lock is a hand somewhat unwieldy to use. That one drink quickly cools, I can not confirm (but I have also made no four hours test because I'm already after four hours at work and the content even for four hours is sufficient). And that's my opinion the second weakness: the cup is really small, that's too bad. So suited my opinion, for half an hour to an hour commute (the frugal nipppen). A lecture of 1.5 hours is already closely ;-). But as long as holding the cup all hot ...
