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Borderlands 3: Storage Deck Upgrades (SDU) Guide

Purchase Storage Deck Upgrades from Marcus in Borderlands 3
Purchase Storage Deck Upgrades from Marcus in Borderlands 3

Marcus Munitions has expanded its business with Storage Deck Upgrades (SDU) in Borderlands 3. In previous games, these could be purchased at Crazy Earl’s Black Market. Earl only accepts Eridium for his services. Marcus, on the other hand, accepts regular cash money. And you know it, “No Refunds!”

What are storage deck upgrades?

Storage Deck Upgrades allow you to increase the amount you can carry. Your inventory is divided into multiple categories, therefore, there are upgrades for the different types of ammo, your grenades, backpack size, bank space, and the ‘Lost and Found’ Machine.

Each type of SDU can be purchased multiple times but as your inventory increases, so will the price of each upgrade.

SDU Items

Marcus Munitions SDU Store in Borderlands 3
Marcus Munitions SDU Store in Borderlands 3
SDU TypeUpgradesCapacity IncreaseMax Capacity
Pistol SDU10+100 Pistol ammo1200
Shotgun SDU10+20 Shotgun ammo280
SMG SDU10+180 SMG ammo2160
Sniper SDU13+12 Sniper ammo204
Assault Rifle SDU10+140 Assault Rifle ammo1680
Rocket Launcher SDU13+3 Rocket Launcher ammo51
Grenades SDU13+1 Grenade13
Backpack SDU13+3 Backpack Inventory slots50
Bank SDU28+5 Bank Space slots440
Lost & Found SDU10+1 Lost item slot15

How much do SDUs cost?

The price of an SDU type will increase after each purchase. High-level SDUs can become expensive, therefore, you should check out my Money Guide as those tips & tricks really help you on your way to easily purchase all these upgrades in Borderlands 3.

SDU LevelSDU Cost
LVL 1$1.000
LVL 2$3.000
LVL 3$9.000
LVL 4$27.000
LVL 5$81.000
LVL 6$243.000
LVL 7$729.000
LVL 8$2.187.000
LVL 9$3.280.500
LVL 10$4.374.000

How much inventory space do I have?

One of the big questions for Borderlands 3 is how much stuff you can carry with you. Well, I can tell you that you will start the game with more backpack space and end the game with more inventory space than in previous games.

StorageBL2BL3 On ReleaseBL3 After Patches
Max Backpack Size394050
Max Bank Space2450440
Max Lost & Found1315

SDU Changelog

Patch 4 Update – Nov 21, 2019

Gearbox Software increased the backspace and SDUs with a patch update alongside the release of Maliwan Takedown & Mayhem 4. All characters now begin the game with 20 bank slots instead of 10. The existing Bank SDUs will give everyone a total of 100 available spaces. An additional 10 Bank SDUs are available to purchase in Marcus’s shop on Sanctuary III using the in-game cash currency, each awarding 20 spaces, for a grand total of 300 total bank spaces!

Patch Update – Sept 10, 2020

Gearbox Software added a few more SDUs alongside the release of DLC4: Krieg and the Fantastic Fustercluck.

Storage Deck FAQ

Where can I buy storage deck upgrades in Borderlands?

You can purchase storage deck upgrades from the Marcus Munitions store. Marcus is located on Sanctuary III. You can find his store on the upper level across from Moxxi’s bar.

How to increase my backpack size in Borderlands 3?

You can increase your backpack inventory space by purchasing “Backpack SDU” from Marcus on Sanctuary 3.

How to increase my ammo capacity in Borderlands 3?

You can increase your Ammo SDUs from Marcus on Sanctuary 3 to increase your ammo capacity per weapon type.

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