I like the screw cap particularly well: In other flasks with "click opening" I noticed that tea / coffee settles after some time on the edges of the opening, which I personally not at all like, as there are very bad, or even at all is not clean. In this bottle does not happen. The screw cap has to be about 1 to 2 turned by 360 ° times, so the drink through the notches provided for this purpose can be poured in the lock. Without spilling and splash ... And just as easy is the cleaning of the bottle, perfect!
Furthermore, I can tell the Isolierzeit so I fill my morning the bottle with hot tea and drink this spread over the morning (about 5 hours). And even in the last pouring the tea is too hot, as if it were freshly cooked, so I has yet to let cool for a few minutes it. So there is absolutely nothing to complain about.
Thus, there is for me only positive things to the flask:
+ Ideal size
+ 100% leak-proof
+ Very good insulation
+ Nice color
So I can only recommend to anyone the bottle.