Good, but bulges quite fast in type-safe children usage

We had bought this bottle (now apparently no longer produced) because of good reviews here and in Öko-Test. The closure is also safe for small children (2 years) to use and when it is closed, it is really about - nothing works out.

Disadvantage of this and other metallic bottles: you dent pretty if they are regularly used by children (fall down, throw the bag with the bottle in it ...)