What has inspired me to try an dmake a +/- 8oz quilt is that a friend has made one using nylon ripstop, and i thought that if I can find some lighter fabrics, I could shave a few oz's more.
Is Momentum available w/o the coating? I want to stick with the 2.5oz because I want to be around a 40' rating with some light clothes.
If I'm 5'-11", 160lbs, wouldn't 75" be a bit more length than I need? My Nunatak Ghost is a medium for up to 5'-10", but is perfect for me.
This sleeping gear is for a specific type of hiking, I do not always try to go so light. This bag will only be used for short trips in the summer, where overnight lows are forecasted above freezing. It is part of a sub 4 pound B.P. Right now my lightest option is my Nunatak, which is 14oz. I have found it to be too warm on most of my summer trips, and although I can, and do, just open it up and lay it over me, I hate the idea of having more than I need. I will always bring some insulated clothing, like a fleece zip neck or my Montbell UL Down Inner jacket. I will also, always use my bivy, in place of a ground cloth. I just prefer the bivy. I have a quilt that is only 6oz's heavier, which allows me to leave 10 oz's of clothing at home, but as I said I prefer to have some insualting clothing, as it allows me to keep moving if the temps were to drop, and also for night hiking, which I often do.
My 32' quilt and bivy total 22.5oz's, which is a bit heavier than yours, but you also have a ground cloth. I don't always bring a tarp, but if i do bring my poncho tarp, bivy, and the 8oz. quilt that will put me at 22.7 oz, with a silnylon shelter and no additonal rain jacket.
It's always fun talking shop, and it sounds like you have some great ideas for me to consider.
One last question on the Momentum, is the Momentum Taffeta an uncoated version, which actually weighs 0.9 oz? I'm thinking uncoated momentum shell and silk lining, but I need to get a sample of the silk first.
Thanks again for all the advice.