Does the bank keep the items you have in it for a specific character even if you switch difficulties, or does the items you've collected on a certain difficulty of the game only work on that level of play?
2 Answers
The bank items are per character no matter what difficulty you are on. However, you will not have access to it for a while until you reach the point where you can get to the bank.
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To add to this, the items you ended the game with are also carried over to use immediately. Commented Jul 1, 2014 at 18:45
You can still use items regardless of which difficulty you looted them on and the difficulty you switched to in Borderlands 2 (or BL1 for that matter).