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Cash... You spend standard cash to expand your slots. This is all done with Marcus on Sanctuary 3. By default there are 8 upgrades per category; I'm assuming DLC will improve the total capacity like it did with BL2. As mentioned the Bank is shared between characters now, no needing to put 4 items in Claptrap's Stash. But those 36 slots or whatever may fill up quick if you're hoarding good legendaries or Annointed gear.
"I'd rather betray the world than let the world betray me." -Cao Cao
Shared vault better be f***ing huge! Otherwise that increases the number of mules you need.
In the past, the mules I made, I would just bring in on boss kills, especially whatever one dropped lots of Eridium, and then the mules would get extended inventory space rather than just what they start with; the Warrior dropped a lot of Eridium, especially if you just afk for a while with Gaige and her Robot. If the inventory space is now just money, then whatever high-level you can solo would be used for the same kind of thing.
I believe the sixth upgrade, out of eight, was shown being 100k+.
That sort of thing can have its values adjusted rather easily though. No official patch process required, just a tweak in values if you start the game with an online connection.
It can, but it you've played the remaster of the first game you'll find that those upgrades are still just as expensive. So it depends on how affordable the deves think those upgrades should be. This is why I've preferred the seperate currency for it in the last two games. You never ran out of money because you didn't have to spend most of your money on those ammo upgrades.