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Just can't seem to hold enough bullets for your favorite gun? Sounds like you need a Storage Deck Upgrade! Supplies limited.
Marcus Kincaid, advertising from an ammo vending machine

A Storage Deck Upgrade (or SDU) is an upgrade item that can be applied to a character's inventory to increase that character's storage capacity. The different types of SDU that players will interact with include a 'Backpack SDU' and a number of different 'weapon ammunition SDUs'. Some kinds of SDUs are automatically applied to a character upon receiving them, requiring no player interaction. These are the 'Weapon Equip Slot SDU' and the 'Skill Point SDU'.

Backpack SDU

Playthrough 1

Backpack SDU

Backpack SDU

The Backpack SDUs each offer 3 additional slots of storage capacity. Each one is gained as a reward for completing one of the ten Claptrap Rescue Missions, for an extra thirty spaces of storage that can be earned throughout the game to a total capacity of 42 on the first playthrough.

With the addition of the Zombie Island of Dr. Ned, The Secret Armory of General Knoxx and Claptrap's New Robot Revolution DLC there are an additional 3 Claptrap Rescue Missions to complete.

  • Completion of Claptrap Rescue: Lockdown Palace in The Secret Armory of General Knoxx has a chance of rewarding a Backpack SDU in playthrough 1 and is not guaranteed.

In summary after completion of playthrough 1 and the DLCs there is a guaranteed total backpack capacity of 48, with a maximum possible capacity of 51 (if Claptrap Rescue: Lockdown Palace provides a backpack SDU).

Playthrough 2

Once players complete the story playthrough 1, the higher difficulty playthrough 2 will allow them to repeat the Claptrap Rescue Missions for more Backpack SDUs.

Unlike the first playthrough, only the first five of these missions (in the Sledge's Safe House, Lost Cave, New Haven, Tetanus Warren, Earl's Scrapyard locations) offer a chance of getting an extra SDU when completed. This can take several tries from either exiting without saving or loading from a backup file because the SDU reward is not 100% guaranteed.

These additional Backpack SDUs are often referred to as glitches by players in Borderlands community forums. Gearbox has not released any information confirming the additional SDUs to be glitches and they appear to be intentional 'bonus' SDUs that players have a chance of obtaining. The appearance of the intentional nature of Playthrough 2 SDUs is the PC-confirmed program code that deliberately increases the chances of obtaining these 'random' SDUs if characters have less than 42 inventory slots already, or has more inventory slots filled when turning in the mission for the reward. Not completing the missions in the first playthrough does not affect the chance of getting an SDU on the second playthrough.

Post Playthrough 2 (Playthrough 2.5)

Once the second playthrough is finished, it is impossible to gain any more SDUs from the Claptrap Rescue Missions. The only known legit way for a character in playthrough 2.5 to gain SDUs is to finish the Claptrap Rescue Missions in a multiplayer game hosted by a player who didn't finish the second playthrough.

Maximum Total Capacity

The original total maximum inventory slots is 57 on the game disc alone after completion of both playthrough 1 and 2, but with the release of the Zombie Island of Dr. Ned, which includes an additional Claptrap to save, backpack capacity can be increased to 63. The two additional SDUs can be gained by accessing the DLC from each main game playthrough (one per playthrough).

In The Secret Armory of General Knoxx, the Claptrap in Lockdown Palace has a chance to reward a Backpack SDU in Playthrough 1 (much like playthrough 2 in the regular game), bringing the latest inventory maximum to 66. Playthrough 2 has not yet been seen to reward another backpack upgrade.

Furthermore, Claptrap's New Robot Revolution features an additional guaranteed 2 SDUs to collect throughout the two playthroughs. This increases the total possible inventory space to 72 slots after completing both playthroughs and accessing the DLCs on each playthrough.

Upgraded Backpack Storage Capacity

Playthrough
Completed
Maximum
Backpack
SDUs
Additional
Storage
Capacity
Total
Storage
Capacity
New Game 0 0 12
First 10 30 42
Second 5 15 57

First Zombie Island
Second Zombie Island

1
1

3
3

60
63

Secret Armory of General Knoxx
(Playthrough 1 -or- 2, not both)

1 3

66

First Robot Revolution
Second Robot Revolution

1
1

3
3

69
72

Claptrap Rescue Missions

Weapon Equip Slot SDU

Two Weapon Equip Slot SDUs are available as required mission rewards in Playthrough 1. Together these increase the weapon equipping capacity of a character up to four weapons, allowing a greater selection of weapons in the thick of a fire fight. Each weapon equip slot provides self-contained 'storage' of one weapon in addition to the inventory capacity.

The missions that offer these as rewards are:

In Borderlands:

In Borderlands 2:

In Borderlands: The Pre-Sequel:

Ammunition SDU

Borderlands

Eight other SDU types that players interact with are SDUs for increasing a character's ammunition storage. These SDUs are purchased from Ammo Vendors and have quality levels that increase in the same manner as weapon quality, indicated by colour. Characters gradually unlock higher quality weapon SDUs as they increase in level and progress through the game. The higher the quality, the greater the capacity and the higher the cost.

Upgraded Ammo Capacity
Rarity Initial White Green Blue Purple Orange Dark
Orange
Quality 0 1 2 3 4 5 6
Price N/A $616 $6104 $16247 $60256 $223286 $722393
Combat Rifle 280 420 560 700 840 980 1120
Grenade 3 4 5 6 7 8 9
Launcher 24 32 40 48 56 64 72
Repeater Pistol 200 300 400 500 600 700 800
Revolver 60 80 100 120 140 160 180
Shotgun 80 100 120 140 160 180 200
SMG 360 540 720 900 1080 1260 1440
Sniper 48 60 72 84 96 108 120

Ammunition SDUs do not have to be bought in the order that they appear in game. Higher capacity SDUs can be purchased later in the game without having to be added to the low capacity SDUs at the start. Consequently, a cost effective method of upgrading all of a character's ammunition limits is to focus on upgrading just the few that are mainly used by the character, then waiting until the dark orange quality SDUs are available before upgrading to the maximum ammunition capacity for all weapon types. Players with The Secret Armory of General Knoxx DLC can purchase orange ammunition SDUs at T-Bone Junction for $223,286 at any time. They can either buy the dark orange SDUs at the vendor at Crawmerax's Lair for $722,393 in Playthrough 1 or join a game on playthrough 2 and purchase the dark orange ammunition SDU at T-Bone Junction for $722393.

Return on investment

Not all SDUs grant the same total ammunition capacity bonus, in terms of percentage. For example, Repeater Pistol, SMG and Combat Rifle SDUs will give a 50% boost per level, reaching a total of 400% base capacity. Shotgun and Sniper SDUs though, will only give a 25% boost per level, reaching a total of 250% base capacity. Revolvers, Launchers, and Grenades gain 33% base per level, ending with 300% base capacity.

Borderlands 2 and Borderlands: The Pre-Sequel

Upgrade Bank

Bank Upgrade icon

Main article: Black Market

In Borderlands 2 and Borderlands: The Pre-Sequel, the amunition SDUs are purchased at the Black Market and have quality levels that indicated by colour. The color scale corresponds to the rarity of weapons in the Borderlands 2 with installed DLCs. The number of quality levels in this games with installed DLCs is extended to 9.

Skill Point SDU (Borderlands only)

A mission reward item; when acquired automatically gives one Skill Point to the player character independent of level. Awarded in both Playthrough 1 and Playthrough 2.

Mad Moxxi's Underdome Riot

Upon completion of the Prove Yourself mission in Mad Moxxi's Underdome Riot, characters are rewarded with a Skill Point SDU. 

Clap-Trap's New Robot Revolution

Upon completion of the mission Operation Trap Claptrap Trap, Phase Four: Reboot, characters are also rewarded with a Skill Point SDU.

See Also