Cxs12 Systainer mystery space?

[OakandAnvil]

I am trying to figure out what festool accessory is intended for this space.
[attachimg=1]
Does anyone have any ideas?

 

[Crazyraceguy]

I would guess that it is for some kind of driver bit case. The older version of the CSX has a little pocket that is intended for the 5 bit clip that was called Twin Box.

 

[onocoffee]

Like crazyrace said - maybe for one of the BT-IMP SORT cassettes?
https://www.festoolusa.com/accessories/drilling-and-screwdriving/bit-holders-and-bits