This datapack adds a single item: the Quantum Linker

It can be crafted as shown in the video: diamond in the center, surrounded by 4 ender pearls with 4 glasses in the corners. That'll give you 2 quantum linkers with matching IDs.

To use them, just drop them on 2 different chests, and boom: they'll act like ender chests that can be accessed by other players and hoppers!

Another use for them it moving items from one location to another, because after you linked two chests, breaking one of them won't drop the items, so you can link old chests to another location, and break the old ones to transfer the items somewhere else!

They do also work across dimensions, but the chunks on both chests have to be loaded

The only thing I don't recommend much is feeding multiple hoppers into a single linked chest, because although it mostly works, it can sometimes delete some of the items fed by the hoppers, so beware of your precious stuff.