I recently made a pillow out of packing peanuts. Here is a picture:



I simply filled a .6 ounce stuff sack with them. They weighed about 1 ounce so the the total weight of the pillow is 1.6 ounces. The pillow is about 6" in diameter and 12" long. The packing peanuts are soft and flexible and more like closed cell foam than styrofoam.

This pillow isn't for everyone. The peanuts make a crunchy sound when I move around. This doesn't bother me but might bother my wife when she camps with me. It also takes up about 300+ cubic inches of pack space. I use a large pack and have plenty of extra volume so this doesn't matter to me. If you are down to your last few cubic inches of pack space this won't work for you.