The "Barrel 2.0" loot/inventory system is a great idea on paper and much needed due to new inventory and loot types being added (and potentially more in the future). However, the current implementation feels rather awkward and borderline frustrating, it's simply not fun (Design reminder: Games are supposed to be fun!). It takes away from the flow of the game as it feels just bad and not fun, especially when you are looting floating barrels, barrels on islands when running away from multiple skeletons, looting in skeleton forts, picking up things quickly on your ship so you can use them, etc..
Thus I have come up with the following couple of small suggestions which in my opinion, will greatly improve the Barrel 2.0 system:
1. Add the old key/button press for taking things out of barrels/storing things in barrels and making it a "Loot All" and "Store All" key/button press (This should be an optional/additional way to loot/store barrels, you could still do it manually item by item like you can now in the original "Barrel 2.0" system).
1.1. Pressing the "Loot All" key/button at a barrel will make you instantly pick up all of the things in the barrel you have room for in your inventory (limits apply, what you can't carry is being left inside the barrel to be picked up later).
1.1. **Pressing the "Store All" key/button at a barrel will make you instantly store all the items you have that can be put into that type of barrel (checks which and how many items a barrel can take and only stores those, leaving the rest in the inventory).
2. Mark empty barrels with the word "Empty" and possibly a different text/silhouette color than full ones when you look at it (maybe even make empty barrels gray in texture or something and turn them nice and brown when there is something in them if that's an option?).
3. Change the inventory slots and barrel slots when you open a barrel to a different color/shade so you can instantly see via color code which is the inventory and which the barrel. I'd suggest leaving the Inventory slot color as it (since it's the same in the inventory menu as well) is and changing the barrel inventory slot colors to a distinctive, bright hue.
Personally, I find the Inventory being on the left side and the barrel contents on the right side to be unintuitive and would like it to be switched, but color coding them to make it clear which is which should be good enough.
5. On the Windows PC, allow items to be dragged and dropped from inventory to barrel using the mouse (also on Xbox One if a mouse is connected to the console).
I think the above tweaks would make the new "Barrel 2.0" loot/inventory system very enjoyable instead of the awkward and borderline frustrating feel it has now and it would actually feel like a fun upgrade to the 1.0 system in terms of practicability and enjoyability.
Addendum: Please translate the barrel names on the Ships (on the land they are translated properly) in the German language version (and possibly other languages) of the client.