Bill if I had a old down bag I would. I want to keep this whole underliner setup under a pound! I have a old sythetic bag but it weighs in at 3.5 pounds whole!
Phat I will look into that insulation Thanks, that might be the ticket. I saw your sil poncho setup last year when I made my plastic underliner. That would be nice but i am out of silnylon. My ripstop underliner so far is 4 oz. Not bad a ounce heavier than the plastic one I made. It will be quieter though! Going to wally world tomorrow to chk out insulation!