As you collect more gear, your inventory will quickly fill up. That's where The Vault comes in. Located in the Tower and other social spaces, The Vault allows you to store excess weapons, armor, and other items. It has a generous capacity, so don't hesitate to use it for gear you might want later or for items you're saving for other characters.
The Collections tab in your inventory is another crucial feature. It acts as a catalog of every weapon, armor piece, emblem, shader, and other item you've ever acquired. While you can't retrieve all items from Collections (especially random-rolled weapons and armor), it's invaluable for reacquiring Exotic weapons, certain Legendary items, and cosmetic pieces. It also helps you track what you've found and what you're still missing for completionist goals.
Regularly deposit items into your Vault and check your Collections to keep your inventory tidy and accessible.