For 32cm width, the notebook may only be very thin.
In my 12.5 "Dell XPS 12 (32.0cm wide, 15mm thick), it sits too tight.
You get it only with effort out again.
It is certainly ideal for all in A4 size.
More suitably with 13 "devices with 32cm width only for very thin devices such as tablets.
Probably the shell sitting in MacBook Pro (only 31,4cm width) better.
For an MacBook Air with 32.5 cm width * 1.7cm I think it is too tight.!
Who cares to not shaking the notebook in the shell, which can be bought.
I want to protect my laptop just in the living room from dust and the cat,
and as it is allowed to sit a little looser.
When measuring the Noteboks also think on any little tucker for wireless mice.
The make the devices usually 1cm wide. (I have but my rausgenommen, and yet it was still too scarce).