Container Bags
MMOItems Required: This feature only works with this external plugin.
Store items inside items, as if they were shulker boxes.
You will be able to open their contents by right-clicking them while holding. No need to place them down.
MMOItems Stat to link the Personal Container to the item.
Personal Containers save items to "Players," like enderchests...
This statement is not entirely true. Personal Containers save items to the UUID of the player...
This stat just gives the item a random UUID to save items into.
Basic Usage
Right-click when holding the item to see the items stored in its UUID.
The first time, if the item is in a stack of exactly one, you will create a brand-new one.
Shift-Right-Click to use item without opening its storage.
Advanced Features
After the first use, you may duplicate this item (or increase its amount using /goop nbt amount) and both items will target the same storage (as they will share the same UUID) allowing for a kind of shared enderchest, between those who hold a copy.
Using /ginfo while holding an item-bag will tell you the people who have ever had access to it.
Limitations
If the item is destroyed, you will be unable to open the storage ever again (unless you somehow remember its UUID?).
The items will be practically lost.