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.
you can also just add more buckwheat if it gets too flat too. although fwiw I bought one a couple years ago and took out a bit to make it flatter initially, and haven't needed to add it back yet
That's true, but I found that just adding wasn't great. You still have the smaller particles in there, which changes both comfort levels (not by much tbh) and what you might call aroma. It gets a kind of musty smell as it deteriorates, which doesn't totally go away if you filter out the smaller stuff