Storage Deck Upgrades (SDUs) determine the number of items and ammo you can carry in Borderlands 3. However, they are extremely expensive! They start out fairly cheap, but triple in cost with every upgrade. Hence, maxing out an SDU means spending millions of Borderlands dollars.

With several types of SDUs available for purchase, and not enough money to go around, your best course of action is to know which SDUs net the most value. Your final objective should, of course, be to max out every SDU in the game, but here are the ones you should unlock first.

SDUs can be purchased from Marcus' Munitions Store on the upper level of Sanctuary III. He becomes available after you have completed the first few missions of the main campaign. However, once you beat Borderlands 3, you can create a new max-level character that skips the tutorial section.

Borderlands 3 - Quick-Change Stations
Borderlands 3: How to Respec (Reset Skill Points)

Not liking your current skill tree? Worry not because there is an easy way to respec your character in Borderlands 3.

Backpack SDUs

Become a Loot Hoarder

Character looking at a bunch of loot
Increasing your storage space means having more loot to sell in Borderlands 3. 

Maxing out backpack SDUs should be your first priority in Borderlands 3. They increase your inventory space, allowing you to carry more weapons, mods, and other items during missions. Like every other Borderlands game; the more loot you can carry, the more you can sell at vending machines for money to buy more SDUs. This is how you farm a ton of money in BL3. If you are not looting and selling first at the start of your playthrough, you will have a hard time unlocking all the upgrades by the time you reach the end-game missions.

fortnite where to find claptrap eye
Borderlands 3: How to Make Money Fast

Making money is extremely important in Borderlands 3 as it can be used to buy useful stuff. Here's how players can make easy money in Borderlands 3.

Bank SDUs

Share Your Loot Between Characters

Borderlands 3 - Bank Vault
Share your items between characters through the bank vault in Borderlands 3.

While new players might ignore purchasing bank SDUs for some of the other upgrades, increasing your bank slots should always be an important priority. They allow you to store more items in the bank vault, becoming a secondary backpack shared between all characters on the same account. If you find a legendary weapon for Amara while playing as Zane, for example, you can save it in the bank for your second BL3 playthrough.

Bank SDUs are the only upgrades that carry over to new characters. The other SDUs must be purchased all over again for every new playthrough.

Assault Rifle And SMG SDUs

Feed Your ARs and SMGs

Borderlands 3 - SMG Blueprints
Some of the best end-game weapons are SMGs in Borderlands 3.

Most end-game builds in Borderlands 3 rely on assault rifles and submachine guns to shred enemies. Both weapon types have increased fire rates and often end up with weapon mods that consume multiple ammo per shot. Hence, they can easily eat through ammunition, especially against Mayhem 10 enemies and bosses that do not go down easily.

Unlock as many assault rifle and SMG SDUs as possible to ensure your Vault Hunter never runs out of bullets in BL3.

Grenade And Lost Loot SDUs

Boost Your Early-Mid Game

Borderlands 3 - Grenade Storm
Some grenades can clear entire arenas in Borderlands 3.

Borderlands 3 allows you to equip various augmentations to change how your action skill behaves. However, it can take around 30–40 hours to advance two skill trees for your favorite action skill augments. Therefore, for the first dozen or so hours, you have no choice but to rely on your grenades.

Do not take them lightly though. Grenades come with their own mods and do massive explosive damage. Some special grenades can clear whole groups of enemies. They are also useful for specific characters. For example, Zane's Digi-Clone action skill consumes grenades to boost your damage, health, fire rate, reload speed, and skill duration. Investing in some grenade SDUs early on can help you maintain that buff multiple times during a fight.

Borderlands 3 - Dinklebot Boss
Borderlands 3: How to Get Loot-O-Grams

In addition to Eridium Shards, you can redeem items called Loot-O-Grams for random weapons and items in Borderlands 3. Here's how to farm them.

As for increasing the number of items you get from the Lost Loot vending machine, its priority level remains the same as grenades. Take the first few levels, but do not go overboard. Having some weapons to sell for extra cash every time you return to Sanctuary is fine for the main campaign.

Shotgun And Sniper Rifle SDUs

For When You Take It Personally

Borderlands 3 - Shotgun Death
Blasting enemies with shotguns dismembers them in Borderlands 3.

Unless you mod your Borderlands 3 experience, shotguns and sniper rifles will always have the lowest ammo capacity. Since they are single-shot weapons, easily overshadowed by other weapon types when pitted against enemy swarms, you might not find it overly important to carry more ammo for either your shotgun or sniper rifle. That said, they also pack the most punch in the game, doing some of the highest damage with head-ripping, body-dismembering shots.

Shotguns are especially great against Maliwan troopers. You might even want to build your Vault Hunter around legendary shotguns like the Doom-inspired Hellwalker. Snipers, on the other hand, can destroy enemies with a critical headshot. They can even be lethal against armored bosses, especially if you roll mods that let you handle a sniper rifle like an assault rifle with insane fire rates.

However, that all means you need to have enough ammo in your backpack. As such, do not shy away from spending your hard-earned dollars on the first six or seven levels of shotgun and sniper rifle SDUs.

Pistol SDUs

Just Enough Clips for a Wild West Shootout

Borderlands 3 - Pistol Skin
There's nothing more satisfying that picking headshots with a Jakobs pistol in Borderlands 3.

Pistols are one of the most versatile weapons in Borderlands 3. Depending on your preferred BL3 weapon manufacturer, your favorite pistol can pop heads like a sniper rifle, blast faces at close range, or pepper enemies like a mini-SMG. You will likely never run out of bullets, especially if you aim for precision with a Jakobs pistol. The ones from Maliwan, however, can consume a whole clip for each enemy. Hence, take some pistol SDUs as needed. This can be considered a higher priority depending on how you are building your character.

Heavy Weapon SDUs

Send Explosive Airmails

Borderlands 3 - Rocket Launcher Barrage
Rocket Launchers do insane splash damage in Borderlands 3.

The rocket launcher is pretty underwhelming until you reach Mayhem's versions of the Plaguebearer or Backburner. The rocket launcher also pairs well with Moze's splash damage skills. Its highly situational usage makes heavy weapon SDUs one of the lowest priorities in Borderlands 3.

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Borderlands 3 Tag Page Cover Art
Borderlands 3
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8 /10
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Released
September 13, 2019
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WHERE TO PLAY

DIGITAL
PHYSICAL
Checkbox: control the expandable behavior of the extra info

Developer(s)
Gearbox Software
Genre(s)
First-Person Shooter, Action, RPG