Ground Sheet Materials, What do you use.

I was thinking of using some packing foam, 1mmor 2mm, it's not that tough puncture wise, but should fold up nice and should give a bit more thermal protection from the ground, probably a bad idea, but hey you never know 
I think the foam is really thin close cell foam, I just have some small peices, but a roll is like 70 bucks.
http://www.officeworks.com.au/retail/pr ... PPFOAM1200
Cheers.

I think the foam is really thin close cell foam, I just have some small peices, but a roll is like 70 bucks.
http://www.officeworks.com.au/retail/pr ... PPFOAM1200
Cheers.