Well I think I've got my gear list refined down enough to make the plunge to frameless. My base weight ranges from 6-11 pounds. I'm thinking of going with a six moon designs feather or swift or going all out and getting a zpacks cuben blast. When I hike solo I maily use a poncho/bivy setup, but when the wife joins we use a TT dbl rainbow. How does the Zpack do with a rolled up closed cell foam mat as a frame with 10-15 pounds of gear? My current pack is a granite gear vapor-trail, I really like it but I feel I could save almost a pound by going to frameless.