I considered MOLLE or PAX but actually I think it's not what I want.
These systems are designed to carry lots of stuff, but also access them on the field easily. I want to carry lots of stuff but I will be unpacking everything at once when I arrive. It's quite different. I don't care as much about having lots of zippers and pouches, I want things to be packed as tightly yet as neatly as possible.
So yeah, again, something like a flight case. Just figure out how I can pack my stuff in a Eurobox in the most organised way possible. Make custom sized compartments and all.