Sorry, I am not a designer but I wanted to share my idea of the vault.
It would be pretty easy to switch tabs, you could have 3x more space. Easy to grab new items. You don't have to go through ton of single section for each armor piece or primary/secondary/heavy separate tabs etc... If you switch tabs you would see another set of empty slots for items etc.
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And I love that your armor section is blank, and the other two are full, exact same scenario with everyone.