Skript BackPacks.
This Skript will give you a backpack with a id that it saves it to and its saves all the items with the id and size.
Commands /backpack give <Player> <BackPackSize>
This command will give a backpack to a player with a Id and size.
Warning
Do Not Mess with the Id you could give a player access to another player's items within their backpack.

If there is a dupe bug please Dm me on Discord Or on Spigot.
My Discord LostFang#6878
Please React and rate this skript.