I don't have any yet, but I do have several Systainer Midi's of the previous generation. I the systainer³ L 's play well with both the midi and the regular systainer³ I might get some. (I have my doorplaner in a midi, a lamello tanga delta that came in a midi, and a 1400w makita variable speed angle grinder fitted with a dustshroud for concrete sanding) the midi and the sys³ only work one way.

I saw one with handtool-inserts that looked interesting, but they weren't in stock, and with an unknown, but presumably long deliverytime.

I saw someone (I believe it was @Cheese ) use a Sys-L for a RAP polisher, so I "most sincerely flattered" him and put my RAP in a Sys-L as well.  I haven't pulled all of the foam to make room for the accessories, I just tossed it in there to get it out of the cardboard box.  It stacks nicely and plays well with the Ms and T-Loc Systainers that I have.

Thanks for that @squall_line , I did use a 204848 SYS³ L 237 to stow a RAP in...tons of room yet as Squall says it plays well with other Systainers. That's a lot of extra gear.