Have the Shulker Box act as a backpack when placed in chestplate slot.

I think it would be handy to have the Shulker Box act as a backpack when placed in chestplate slot.

I've seen suggestions asking for an additional slot and a backpack, but I think it would be a little less overpowered if you had to use your chestplate slot as the backpack slot because then you'd be forced to choose between an elytra, a chestplate, or the shulker backpack. Additionally using a shulker box as a backpack doesn't remove the need for shulker boxes, nor does it allow you to have a large backpack early game.

I could see it being useful when grinding large amounts of items like sand and gravel, or when mining, and because it's a shulker box it would not be able to be placed inside other shulker boxes.