My pillow cost about 50¢. I went to a garage sale and found an open cell egg crate mat that is 1.5” thick. For my pillow I cut a 6”x14” rectangle. It weighs about 1.5oz. If I sleep on my back, I stuff it under --only-- the small of my neck, just for support. If I sleep on my side or stomach, I fold the rectangle in half. Yes, it’s a small pillow, but it still does a good job of propping my head and allows a cush feel. When packed, it’s about the size of a soda can.
For the pillow case, I just drape my car shammy over it. That’s probably my most multi-use item in my pack that ends up being the same weight as my pillow.
I use the above on about 1/2 my trips. The other 1/2, I just fold my hiking clothes into the quilt/bag stuff sack and also drop my shammy over it for a nice feel. But I admit, it’s not as cushy as open cell foam.
May everyone find their pillow zen