Seeing others' cases on the forum made me think about my own. Finaly it happened.
The suitcase size fits with the powercord on the side of my early Master module. It's big enough for reverb springs tank on the upper side and for packing powerplug and box of patch cables on the lower side. There is even a place for a powerbank when I'll find the right one, so I will be fully mobile with my travel case. The case may be closed with inserted patchcables! 4I/O provides a nice stereo for the headphones and I'm good to go! The suitcase is complete with stickers