Bundles of Holding

The Bundle of Holding is an item that can only hold a single item type, but can hold an infinite amount of it.

Even if the item isn't stackable.

It cannot be crafted. Instead, it can only be found rarely inside of dungeon loot (bastions, end cities, nether fortresses, and more), or as a very rare novice trade from a villager or wandering trader.

(Regular dungeon loot spawn: 3% chance)

Controls are the same as regular bundles. Left click to place items into the bundle, right click to remove them, one stack at a time. You can hold shift and remove or add one item at a time (using the same controls) or use the scroll wheel to decide precisely how many to insert/extract.

Additional Notes:

Right clicking in the air will drop one stack at a time into the world, and sneak right clicking will drop one item at a time.

Bundles of Holding won't burn in lava. If the bundle is destroyed in the world by any other means, it will drop a maximum of 16 stacks (any other items will be lost). 

They can also go in shulker boxes (like regular bundles).

(Fabric version requires Fabric API)

*Note: infinite is *more or less* infinite, which comes out to be many quintillion stack size.

(Feel free to use in modpacks)