As good as the game is overall, there is one element that I am starting to find incredibly annoying the more I play and that is inventory management. From what I've read, other people seem to be equally annoyed and while there are various suggestions like filtering by type and others, I would like to concentrate all possible improvements related to inventory management in one thread for a more focused discussion on the topic. So here's some of my points:

1. Better categorization of items
I'm placing this first as it's necessary in order to properly implement some of the subsequent points.

The display filters on the left side of the inventory are good but in order to better group, find and combine items I think more categories are needed especially considering items that can serve multiple purposes. For example, in consumables you can find potions, food, drinks and also some ingredients; in magical there's both arrows and scrolls. But searching for a specific item can be tedious if there's lots of stuff there, so either subcategories or multiple standard categories could help a lot to reduce the eye strain.

2. Specialized bags
I know you can take containers and put them in your inventory to make your own item sorting, but those containers take a lot of weight and are also not very ergonomic to use. At the moment I have to reserve almost 20% of my carrying capacity just to save my sanity when searching for something in this inventory tetris mania.

We should be able to buy special containers like scroll cases, potion cases, ammo pouches, tool cases, food packs etc where items that you loot, automatically get sent to their respective bag if you have one. I think this simple automatic placement would reduce the amount of inventory management more than any other feature or sorting filter.

3. Sort filter by item type/category
This one is obvious and in combination with point 1 can simplify searching for something specific a lot. Plus, the inventory looks better.

4. Link items on skillbar from containers
It can be done temporarily, but the shortcuts keep getting removed from the skillbar

5. Stacking for all identical items
Currently some items stack, others do not (ex: bonedust)

6. Access container contents in the vendor screen

7. Keep same item sorting/positioning in the vendor screen