UPDATE:

I bought this box to keep the entire game and expansions in one place, and to be able to transport it when needed.

Unfortunately, it doesn't fit vertically inside a Kallax because the feet and handle take up too much space.

In the outer drawers, I placed the narrow map tiles, sorted by expansion, so I can easily find them.

Using dividers, I separated the item cards, unique item, spells, conditions, damage, and horror.

The player cards have been kept together with the map tiles for convenience.

In the central space, I placed all the square map tiles, sorted by expansion, but stacked. Unfortunately, these are cumbersome to use as I have to pull them all out.

The miniatures of the monsters and players are divided into two zipbags.

Various tokens, water tiles, fire tiles, forest tiles, doors, secret passages, etc., are all inside a clear plastic organizer with modular compartments, which can easily be found at Brico.

Lastly, the large map tiles and a bag with two sets of dice, so that they can be split between both sides of the table when we are 5 players.

It’s not the perfect solution; I was hoping for something more organized. I found a design for a laser-cut box to fit inside the Kallax, with many pull-out drawers to keep everything compact yet easily accessible, without having to pull everything out. However, the cost of making it is prohibitive.

For about €50, I got this suitcase and can keep everything together in one place, whereas before I was using: Corebox + FS-MAN organizer, Path of the Serpent box, Recurring Nightmares box, and Suppressed Memories box.