[1.11.2] Method for storing items within an item

Hi all,

I'm currently trying to create an item that has the capacity to hold a single ItemStack within itself. I'm just wondering which of the methods available I should be using. I've been browsing through githubs for things like Iron Backpacks and Actually Additions, even McJtys tutorials, and they all seem to use different methods, be it ItemStack[] or ItemStackHandler or IInventory. The ones that are dealing with tile entities are a bit challenging for me to apply to an item as well, due to methods available on TileEntity that aren't there on items.

If someone could point me in the right direction as to what I would be best using that'd be much appreciated.

Thanks in advance.