I've been trying to lv all DoH and DoL to 15 to give myself a strong crafting base, and inventory was a nightmare, especially before I got my first retainer!!! I actually like that you have to be 20 to have a retainer, and I'm not sure a simple "sort" is what I want.

Some ideas:
-let HQ and normal items stack together
-give players filters to determine what goes in each tab (I would like my 1st tab to be consumables, tab 2 to be raw materials, tab 5 to be gear...etc)
-materia bag
-tackle box (fishing lures)
-CUL has way too many items - idk how to fix it - cooler, spice rack?
-Even the armory is tough when trying to level DoL, and DoH... tool box? Or maybe just ONE hammer for BSM, GSM, CRP, ARM, MIN?
-some inventory limit makes sense, but you need so much stuff!

I'm sort of at a loss for how you're "supposed to" do it. It makes sense to collect the stuff you need then make it into things, but you simply can't do that.