I'll be starting a bivy project tonight, I plan to use pertex equilibrium [I love equilibrium for it's "water pulling" ability] for the lid and 1.3 silny for the base. I plan to simply lay out my sleeping bag and "tailor" my patern accordingly. I f all goes well, I'll get some pics up.
I plan on using it by itself in rather dry conditions, and with a tarp, no ground cloth, in the rain.
Does this seem like a reasonable plan? Will I regret not having a groundcloth?
Here goes nothin'...
BTW.. If you were curious about equilibrium, IT IS NOT WATERPROOF OR RESISTANT OR ANYTHING. It basically absorbs water but releases it very quickly.
It is claimed "weather-proof". Yet I doubt it is even that. What ever that means anyways.