Running low on space in Borderlands 4? Whether it`s your character`s backpack, the bank, or even the lost loot machine, storage limits can quickly become a hassle. Fortunately, with a few strategic upgrades, you can significantly expand your carrying capacity and manage your gear more efficiently, ensuring you never miss out on valuable loot.
How to Increase Inventory Space in Borderlands 4
Expanding your inventory in Borderlands 4 is primarily achieved through the SDU menu. SDU, or Storage Deck Upgrades, are valuable resources you acquire throughout your adventures. This comprehensive system not only boosts your item carrying capacity for gear and consumables but also allows you to increase the maximum ammunition for various weapon types, giving you more staying power in combat.
Which SDU Upgrade Should You Prioritize?
When navigating the SDU menu, certain upgrades offer more immediate and impactful benefits to your overall storage and gameplay. We strongly advise prioritizing the Backpack upgrade, followed by the Lost Loot and Bank options, to maximize your Borderlands 4 storage efficiency and convenience:
- The Backpack upgrade is paramount as it directly determines the number of unequipped items your character can carry at any given time, making it essential for extended looting sessions.
- The Bank upgrade is also highly beneficial, providing a secure location to store items for your alternate characters or valuable gear featuring specific Firmware mods you want to keep.
- The Lost Loot machine is crucial for retrieving items you might have accidentally left behind or missed during intense encounters, preventing the heartbreaking loss of valuable, especially legendary, drops.
- Weapon ammo upgrades are less critical early on. Ammunition is generally plentiful, and vending machines are frequently encountered during exploration and combat, making these a lower priority for initial SDU spending.
Keep in mind: The cost of SDU upgrades progressively increases for each category you enhance, so plan your investments wisely.

How to Earn More SDU?
SDU points are primarily earned by engaging in various optional in-game activities, encouraging thorough exploration. For example, completing objectives in locations like Safehouses and Order Silos not only awards valuable SDU but also unlocks new fast travel locations, improving your traversal across the game world.
Additionally, discovering and interacting with various collectibles, such as Survivalist Caches, Evocariums, Propaganda Speakers, and Lost Capsules, will also contribute to your SDU reserves. Essentially, consistent exploration, completing side objectives, and general gameplay are key to accumulating more of this valuable resource, allowing you to continually upgrade your storage capabilities.
This concludes our comprehensive guide on expanding your inventory space in Borderlands 4. As you venture further into the game world, consider also focusing on unlocking additional Vaults to further enhance your experience and discover new challenges.
With expansive frontiers to explore, fierce foes to overcome, and legendary loot waiting to be discovered, your journey as a Vault Hunter in Borderlands 4 promises continuous engagement. For more in-depth assistance and expert tips, explore our comprehensive Borderlands 4 guides.

