Are you a True Vault Hunter ?
Tediore has created for you The Portable Digistruct Backpack, a new technology which digitize your stuff and give you an unlimited space to store them.
You say cheated ? We say totaly lore friendly.
Who is useless now ?
By using our technolgy you agree to our confidentiality agreement (which mean we know everything about you and we can sell your personal data's infos).

Modify the base backpack space to unlimited.
Modify the bank SDU Lv1 to unlimited.

The unlimited space also reduce the lags in huge inventories.

Known issue:
The Unlimited BANK space DOES NOT WORK in Arm's Race, you can't retrieve your gears because the game see a negative space.
To fix it, you can temporarily modify it from -1000 to a positive value depending on your stuff in bank.
The lesser the better because the game loads every slots even the empties ones.
For example if you have 100 items in your bank, put something like 150 or less.
Then either restart your game or go back to the main logo page to reload the hotfixes before starting an Arm's Race.