Separate PvP and PvE bags that hold only bound Armor and Weapons. The PvP bag just hold bound items with Impenetrable traits. The PvP bag holds only bound items with any other trait. They would be sold separately, and you can buy both if you wanted. Each bag holds 500 items, just like if you had a private guild bank. Z does not mind a private guild bank, but bound items cannot be stored in the guild banks so a BIB would give players some relief from the numerous bound sets/weapons in the game now and will be added in June.