As I find myself going lighter and lighter a problem keeps occuring with my current packs: they are simply too big :D. I simply don't take enough gear anymore to fill up my gossamer gear G4 or my recently home-made BP. All that goes in the body of my pack nowadays is my sleepingbag, cooking pot, TP, emerg. ziplock and food. All this would fit in a 30 liter backpack, which I don't have, but I am planning to make one like the 5yrds to SUL soon.
The UL packs I have been using so far all use my TAR Z-Rest sleeping pad as a virtual frame, but I guess that with a smaller volume pack my Z-Rest would be 1) too large and 2) no longer used as a virtual frame.
So now I am wondering which sleeping pad I could take on a SUL and SSV (Super Small Volume) trip? Any inflatable seems to me too large and heavy, I have tried and liked bubblewrap, but I am looking for something a bit more durable. Now the balloonbed would seem right, but I have doubts about durability and I have strong doubts about the insulating properties of the balloonbed, which should be zero. The GG pads seem good, but I wonder if such a pad actually fits inside a 30 liter pack?
My question: what do experienced SUL hikers take as a sleeping pad?