Lufthansa suitable cat carrier

So i have adopted a male stray very recently and am learning all things cat. Since we are relocating to Austria I would like to take him (5kg) in the airline cabin - which is possible with some limitations re carrier size.

Having read tons of reviews it appears that most carriers get easily ripped apart due to poor quality zips.

Is there an airline that so far has stood the forces? He is a nervous cat and does not yet respond well to being carried around etc.
Most likely we will give him meds to relax a but but my concern is that he might rip the back mid flight. And ideally I would rather not check him into cargo - unless this is truly better for the animal.

Sorry for the beginner question - I just want to make sure he is comfy and safe, knowing that the trip and change itself is stressful enough!