Updated my "small" backpack and belt kit:
The backpack went from this:
to this:
Went from 9 Litres in capacity to 12 (pouch is roughly 3 litres), but now I can organize my stuff better since I now have three compartments instead of one.
And regarding my belt kit it went from this:
to this:
The two side pouches will be used for navigation stuff (left side) and Leatherman Wave+, head torch and various bits (right side).
Now though, that Multicam pouch stands out like a sore thumb, so I will probably have a similar sized pouch made in RG as well, perhaps with a few details added to make it more practical.
And probably fill the empty space on the right with a pouch for my Garmin GPS.
All I need to do now is wait until the next 8h+ event to put the new setup to the test.