I can make my own pattern.
This is what I want.
Very light weight.
Maybe about 14 oz
Synthetic fill, good to maybe 40-50 degrees.
I want a zippered foot box, and I want to be able to open it up into a blanket.
A tapered blanket is fine.
I want to use it as a summer bag, and as an overbag for a 15d bag to add another 10-15 degrees of warmth.
I think I want a taffetta lining so its somewhat more comfortable but that will add a tiny bit of weight.
The exterior a lightweight ripstop.
I want a filler, that is a blanket that I can just sew the edges and maybe stabilize it every so often with
a through thread or what ever you call it.
Looking on quest outfitters to me it looks like a combo of 1.1 oz uncoated ripstop for the outside, 1.9 oz TAFFETA for the inside and primaloft or Climashield for the stuffing.
Any advice welcome.