Quantum Entangled Chests

Specially crafted paired chests.  Perhaps 2 trapped chests + 2 Eye of Ender (+2 netherite, if you need to make it difficult for balancing).

Operates like an End Chest, except that they are paired chests and can only have two in a set. They would be linked and items in one can be access from the other **by any player** - instead of the each player having their own content set.

This would allow two players to transfer large quantities of materials across long distances quickly. Adding interactions with hoppers could allow for the creation of interesting distributed (and inter-dimensional) item sorting systems.