IMO, they really need to add the scroll, potion cases, etc from BG1/2 to BG3. Specific item type containers that helps the players keep organized - not just random bags you can toss any random thing into.
+1. Custom backpacks aren't the same as dedicated [consumable] cases.
With a backpack, items only automatically go into that backpack IF:
a.) you already have at least 1 of that item in the backpack, AND
b.) the correct character picks it up.
The former encourages you to never use the last of any given item, and the latter encourages you to maintain 1 backpack per resource type per character (which means you now are discouraged from using the last 4 of any given consumable). Or you have to constantly manage who's picking up items/shifting items between characters to get them out of your main inventory and into a backpack.
Plus, obviously, dedicated [consumable] cases will look visually distinct = easier inventory management.
