Bags of Transference

A pair of burlap bags. These two bags are always found as a pair. They each have a capacity of a pouch. Items inside cannot be located by magic, though the bags themselves can be. As a bonus action, a creature that knows the bag's command words can speak them, causing each bag's contents to switch to the other. There is no range limit to this feature, though both bags must be on the same plane of existence.