I can't believe this is stumping me but I can't seem to figure out how to equip multiple item from my inventory. I can use them from the inventory screen but I can't see how to actually equip them to use on the fly. Playing on 360
On the screen where you equip weapons and armor, the bottom left most part of the screen contains 10 "belt" slots. If you select one of those, you can pick a consumable item to go in the slot that you can then use on the fly.