We bought for our 4 year old son, so he has the way and the sport enough to drink.
100% close the bottle is not, they should already be transported quite upright, which they can be but sometimes briefly turned upside down and nothing happens.
Only if it is a long time it runs out.
Carbonated But it is not at all!
The cleaning is not done just quickly, because you have to have set aside a little more time.
But for our 4-year-old I was pretty that he does not have to only difficult to open a screw and then showered half in a hurry.
He's coming along great with the Strohalmtechnik.
