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Backpack SDU increase +3
1st Rank - White: 4
Ammo and Grenade SDU can only upgrade to 7th rank. In total it costs 2590 Eridium in order to buy every upgrade.
- The Black Market is involved in the mission Plan B in which Crazy Earl also sells a fuel cell with a regular purchase. After Normal mode, Plan B no longer requires a purchase as obtaining the fuel cell from Earl is automatically marked as completed and skipped, although Scooter's quotes will remain the same.
- A system-wide update on 02/04/13 added another ammo upgrade for 50 Eridium as well as two additional backpack and bank upgrades are available for 50 Eridium and 100 Eridium, each. These are available without the Ultimate Vault Hunter Upgrade Pack DLC.
- A system-wide update on 08/29/13 added an additional upgrade for 100 Eridium and two additional backpack/bank upgrades for 150 and 200 Eridium.
- The upgrades go in the order of rarity: White, green, blue, purple, orange, pink (for both 6th and 7th rank) and pearlescent (for the 8th and 9th ranks).