In reply to David Coley:
Hi Dave,
I've followed other's advice including Andy K's and it has worked for me in alps and himalayas. Basic plain foam mat ( Ie Karrimor expedition ) then modify:
Corner hole reinforced so it can be tied down / clipped in.
Cut down to 3/4 length for your height and use filled rucksack / ropes for head or feet
Cut mat into 3 or 4 sections and rejoin with gaffa tape so you can fold it and put it away inside sack.
Sometimes I take a very thin extra section of mat for standing on, adding underneath bum cos I'm old
Use permanent marker to mark on games / boards
Mark