Military Spec MacBook Air case. During use, it’s the external battery and power supply that are very well protected, not the computer itself. The MacBook Air is hardly a Toughbook (of course, a Toughbook is also 3 times as heavy).
I had trouble seeing where it actually houses the MacBook Air? In the first photo it looks like the battery and custom power-charging cable. There does not seem to be much clearance for the lid of the Pelican case if you put the MacBook on top.
there is a very slim slot above the battery and charger, that holds the closed laptop. When it's all close everything is quite well protected.
It looks to me that the biggest cut-out is exactly the size of a 13" MBA. The computer also isn’t very deep, 0.4" on average.