25 kg is not ok at all - at least not in a small plane!
All I can say to this topic is: The stupidity of some passengers must be boundless. Some brainless human beings destroyed on today’s evening flight from ZRH to WAW the box for the hand luggage. As a result, there was not enough space for hand luggage, and my girl friend could not even stow away her hand bag. When will Swiss undertake something in this matter? It is sooooo anoying!