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Borderlands 4 SDU Guide: How to Expand Your Inventory Fast

SDU from Safehouses, Order Silos or collectibles funds tiered upgrades across storage plus ammo.

Overview

  • Open the SDU menu to expand capacity, with the Backpack upgrade directly increasing how many unequipped items you can carry.
  • Players start with a small Backpack holding about 16 items including equipped gear, making early upgrades impactful.
  • Use the Bank as an immediate buffer to clear space and store gear across characters, then expand it via its SDU track.
  • The Lost Loot machine recovers items you didn’t pick up, and its capacity increases through its own SDU upgrades.
  • SDU is awarded for optional activities like unlocking Safehouses, completing Order Silos, and finding collectibles, with each upgrade starting at 5 SDU and rising in cost; ammo tracks have seven levels while Backpack, Bank, and Lost Loot have eight.