I came across the Salewa bottle and can say that I have found the perfect bottle.
It is not too bulky, so fits into virtually any pocket. The closure is super tight - even with carbonated drinks it!
The practical opening for drinking is perfect. The size of the opening fits well, not too big that you're afraid that something will go wrong, but not too small that nothing comes out.
The design is very appealing. Simple but chic. Not like other steel bottles, the more reminiscent of kindergarten or primary school.
Warm drinks can indeed keep relatively bad at it, because the bottle is hot too, but it's also no thermos.
The only negative that I can say is the string that holds the lid. She dropped me off immediately. After contact with the very nice support this is very easy to apply again. But even without this line, an all-around great bottle!