The picture I linked is of a buckwheat pillow. Had no idea they were a thing before today.
What about silk or bamboo pillow cases?
I’ve only ever really used cotton pillow cases and cotton stuffed pillows. I recently upgraded to a foam pillow that I’m enjoying.
That reminds me of the cheap weighted blanket reviews I saw where people were complaining about them leaking beads after a while. I think it was glass then though.