My 1/2 ounce adjustable styrofoam pillow recently completed its maiden voyage (4 day backpack). It worked well so I thought I'd share it with my fellow sleepers and/or lay-on-your back readers. It is a box shaped piece of strofoam packaging that came with a printer I recently purchased.*
Here are some pictures:
Three heights (4", 5", 7.5") depending on which way you place it
Could double as padded storage for glasses, camera, binoculars, etc.
Line it with a piece of plastic bag and it could be a cereal bowl
*I would describe this as "in-the-box" thinking