I'm looking to make my first quilt that will be comfortable down to 30 degrees for a 4 week trek on the Superior Hiking Trail in late September to October. I'll be using this inside a bug netting tent that is then under a tarp similar to MYOG 5yd tarp. I've already read about 20+ threads on quilts and fabrics, but more I read there are 2 main things I need answered.
I need some input from experience people on whether to use an inner and outer layer of Momentum ripstop and taffeta, or to use 2 layers of straight 1.1oz Nylon Ripstop. My concern is that the Momentum will cause a clammy and damp feeling, and on the other hand the 1.1oz Nylon Ripstop will compromise the warming ability because it is too breathable. Thoughts on the fabric?
My other concern is that if I get the normal 1.8 inches of synthetic loft for a 30 degree bag, by the time I get to my 3rd week it won't be performing well enough due to being compressed so much. So I was thinking of using 2 layers of the 5 oz to reach 2.4 inches and then figure it'll compress down to somewhere around 1.8. Is this sane reasoning?
Regarding down bags, it'll most likely rain on me every other day up there, so I don't think down is the best choice. I'm also not sure I'm up to sewing all the baffles and dealing with the intricacies of the baffle size to down ratios.
For my clothes, I'll have silk long johns and long shirt, plus a fleece vest, rain coat, and a hat and balaclava available.
Any help would be greatly appreciated. Thanks.