I had some sturdy shelf liner that I had bought at a garage sale a while back and finally put it to good use. I folded over a piece and laced it together with paracord to make a pouch that I can hang from my ridgeline. It should make a great spot to stash a small book or whatever else I need.
EDIT: After a laced the edges together I flipped it inside out to get the seams inside. This also helps it stay open. Have a look at the pictures.