For Borderlands on the Xbox , a GameFAQs Answers question titled "How can I unlock the I was wondering how do I unlock the other 2 weapon slots. For Borderlands 2 on the PlayStation 3, a GameFAQs Answers question titled I' m now in Sanctuary, level 10, and until now I haven't opened up these slots yet. For Borderlands 2 on the PlayStation 3, a GameFAQs Answers question titled I'm now in Sanctuary, level 10, and until now I haven't opened up these slots yet. I believe the Backpack SDU is in the "Fetured Item" area of the store. Watercooler Help Desk PC Trading PS3 Trading Xbox Trading Muster by System Recent blog posts. Censor Bypassing Trolling Flaming Disruptive Posting Off-Topic Posting Other must leave note below: Don't have an account? Log In Sign Up. PlayStation 3 Action Shooter First-Person Arcade Borderlands 2 FAQs. Recent How do i input modded weapon codes? Questions Tags Users Badges Unanswered. Answered How do you get the 3rd and 4th weapon slots? You cannot miss it. PC , PS3 Franchise: Borderlands M - Titles rated M Mature have content that may be suitable for persons ages 17 and older.