It's really a simple idea so why not? 20 spaces each for armor, weapons and general items doesnt really cut it especially with multiple characters.
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yeah my vault is full of legendaries and exotics. i have exotics i dont really use but i still like to keep around more or less as trophies. plus they said they were gonna buff some exotic weapons so i dont want to get rid of my thorn, bad juju, etc in case they decide to make them good.