So, we're speaking here about a item which modifies the CW and a mechanism to generate a cratelike Bag item on the ground, with the contents of the player's inventory? (When Bag is unequipped from accessories slot and dropped on the ground)Just dumping the inventory on the ground as "Drop All" function could be certainly a option, too, but yet...
I think there is no need to overly complicate things. Metal mask is a headgear, we could just as well replace it with "iron horned helmet", but it doesn't matter.
Head protection item is head protection item. Think less about how it looks and more what purpose it serves in the game.