Like its predecessors, Borderlands 4 is a game overflowing with an assortment of weapons, and you will have great difficulty lugging around all of your favorites at once with the initially limited inventory space. Fortunately both your Backpack and Bank slots can be increased by spending tokens in the Storage Deck Upgrade (SDU) menu, not to mention increasing ammunition capacity for the major gun groups and adding more slots to the Lost Loot machine for the pickups you fail to collect.
This Borderlands 4 guide has everything you need to know in order to farm SDU tokens, and maximize your carrying capacity.
Safehouses
Earn a flat 40 SDU tokens for unlocking each of the 14 Safehouses to be found scattered across the map. This activity is worth a total of 560 SDU tokens
Silos
Earn another flat 40 SDU tokens for unlocking each of the 9 Silos on the outer rim of Kairos.This activity is worth a total of 360 SDU tokens
Drill Sites
The initial clearing of each of the 6 Drill Sites around Kairos will earn you 40 SDU tokens apiece. This activity is worth a total of 240 SDU tokens
Augur Mines
The first clearing of each of the 7 Auger Mines spread across Kairos will also earn you 40 SDU tokens apiece. This activity is worth a total of 280 SDU tokens
Order Bunkers
The initial clearing of each of the 6 Order Bunkers situated all over Kairos will earn you 40 SDU tokens apiece. This activity is worth a total of 240 SDU tokens
Crawlers
Bring a battery to each of the 11 Crawlers abandoned across Kairos in order to earn 40 SDU tokens apiece. This activity is worth a total of 440 SDU tokens
Propaganda Speaker
Survive the enemy waves after activating these Propaganda Speaker towers and gain 20 SDU tokens for your trouble each time.
Evocarium
Complete each of the 18 Evocarium platforming challenges to earn 15 SDU tokens every time. This activity is worth a total of 270 SDU tokens
Loot Capsules
Return any Loot Capsules you stumble upon across Kairos, to Capsule Capturer vending machines for decryption and recover 15 SDU tokens each time.
Electi Safes
A somewhat meager 10 SDU tokens can be found for cracking open each Electi Safe you happen across.
Survivalist Caches
Loot as well as 10 SDU tokens are to be gained from random Survivalist Caches that you chance upon.
Auger Shrines
More loot and 10 SDU tokens are to be granted by Auger Shrines that you worship at, when discovered.
Vault Symbols
A paltry 5 SDU tokens will be awarded for interacting with any Vault Symbols you detect on your map.
When prioritizing the expenditure of SDU tokens, focus on your Backpack first, then Ammo capacity for your preferred weapon types. The shared loot space that is the Bank can be increased later, especially if multiple characters can contribute towards its expansion. The Lost Loot machine is a waste of SDU tokens unless you are somehow drowning in excess quantities.
Those are all the best methods for farming SDU tokens fast in Borderlands 4, so that you can expand all of your storage spaces.
