To begin the loading process of packing the case, I deflated the wheels and placed one in each side, putting the rear wheel in the deeper side with the cassette facing down.
I found it was best to compress the fork and hold it down with a strap. It was a bit difficult getting a 150mm fork to fit properly without that trickery, and it was easier since the DT Swiss EXC 150 collapses to 90mm using its Launch Control system.
When I broke down the frame, I took the air out of the rear shock, and disconnected it from the upper link (I later I found it easier to just take it off completely). I then removed one lower link bolt (rearward), plus one set of the upper link bolts (front set). I was then able to fold the bike back upon itself. You might be able to fold it more if you had a quick disconnect (cable splitter) for the rear derailleur cables, otherwise the cable housing binds a bit. Note, per the recently departed Sheldon Brown, Derailer, Not Derailleur!
Note: this is where another bike might deviate from the same steps?