Backpacks

Your backpack is a second inventory that travels with you — open it anywhere with /bp.

Two things make it more than extra chest space:

• It is death-proof. Whatever is in your backpack survives dying in every dimension — including the lose-everything ones. Anything you truly cannot afford to lose belongs in the backpack before you step through a portal.
• It grows with your rank. Higher in-game ranks unlock additional backpack rows, so the ladder from Newcomer up steadily expands how much you can carry.

The backpack's appearance is a separate thing — cosmetic backpack skins come from crates and bosses; see Cosmetics.