option to make user inventory smaller without modifing the gui adding barrier blocks that cant be moved. Not sure if there is a way to literally disable a slot because modifing the gui would break the resource pack's inventory skin. I feel like having 2 "backpacks" is too op for survival.

"option" 1: disable the inventory and add 2 arrows on each side of the inventory to navigate through the backpack.

"option" 2: Add like the JEI gui on a side that contains backpack items so instead of needing to close a workbench or furnace or anything you could just take the items and put them there.

Not sure how could anything of this be implemented