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Borderlands 3: Storage Deck Upgrades 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?

With storage deck upgrades you can expand your inventory space. There are a variety of upgrades you can pick up. You can purchase the same type of storage deck upgrade a couple of times. You got upgrades for your different types of ammo, your grenades, backpack space, bank space, and the ‘Lost and Found’ machine.

SDU Items

SDU TypeCapacity Increase
Pistol SDU+100 Pistol ammo
Shotgun SDU+20 Shotgun ammo
SMG SDU+180 SMG ammo
Sniper SDU+12 Sniper ammo
Assault Rifle SDU+140 Assault Rifle ammo
Rocket Launcher SDU+3 Rocket Launcher ammo
Grenades SDU+1 Grenade
Backpack SDU+3 Backpack Inventory slots
Bank SDU+5 Bank Space slots
Lost & Found SDU+1 Lost item slot
Marcus Munitions SDU Store in Borderlands 3
Marcus Munitions SDU Store in Borderlands 3

How Much do SDUs Cost?

Each time you purchase an SDU the price of that SDU type increases. If you don’t have enough cash for these upgrades then here is an Easy Money Guide for Borderlands 3 that I wrote.

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 can you carry with you. Well, I can tell you that you will start off the game with more backpack space and you will end with more space than in previous games.

  • Pre-Patch Storage Space
    • Max Backpack Size = 40
    • Max Bank Space = 50
    • Max lost and found storage = 13

Patch 4 Update – Nov 21, 2019

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!

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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