I have lifted these pictures straight from Backpackinglight.co.uk so I hope Bob doesn't mind. They make this little pillow themselves and it weighs 62 grams (that's just a smidgeon over 2 real ounces for the metrically challenged like me)
You can have one for just under a tenner from Uncle Bob and worth it's weight in gold! I stuffed mine with my North Face soft shell and it was gorgeously comfy. The pillow, coupled with the hip flask (well, the contents of, shall we say) and you are guaranteed a wonderful snoozy night's sleep.
So thanks Bob. Sweet dreams!