Is 20 really enough, especially as it is shared between the three character slots?
I have this horrible feeling of having to trash SOOOOOO many good weapons that it's going to hurt. Imagine having to trash Legendary weapons just to make way for a new Exotics. Damn, that would make me cringe.
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I think 20 slots is perfect considering the vault is just for things you'll swap between characters. One individual character has alot of storage space as it is. Even if you have 3 characters, you'll only use the vault to swap items. And if you need more space because you've found alot of rare things, why not just create a "storage character" that you only use to hold the cool stuff you don't want to use vault space for?