great bottle, good handling - but unfortunately after 4 months faulty !!

We have 2 bottles in use, both since the beginning of December.
The closing of the plug is effected by folding ud "squeezing" the Saugstopfens so that no liquid can escape.
Precisely at the location where the material is squeezed, a crack is created in the first bottle, that the bottle is no longer useful. With such expensive bottle we had not expected.
The bottle 2 is also on the verge of being broken, a crack is distinguished since.

Nice design, but quality and price do not match.