Last summer I used my 52 ounce TNF 15 degree down bag and 27 ounce Thermarest LE. Comfy but heavier than I want to carry.
I had been planning to sew a quilt or topbag for the Sierra Nevada's frosty nights. Going by Ron Bell of MLD's info it seemed that a Climashield XP quilt to keep me warm down to below freezing would require 7.5 ounce/yd insulation and weigh 26 ounces. Buying it from MLD would cost $230 or I would spend $100+ on materials to sew it myself.
I was also looking at a new pad- still self-inflating but lighter than the LE.
With those plans, REI's sale popped up and I scored. I bought the 15F rated REI Sub-Kilo women's long for $85. It weighs 31 ounces in the stuff sack. I also got a 18 ounce REI self-inflating 48"x20" for $16.
With 57" girth at the widest the bag is a bit snugger than ideal. I think it will work great as a quilt in mild weather and as a bag in colder weather. The pad is much thinner than my LE but was comfortable on my wood floors for a nap.
I think I scored quite well- $100 to cut almost two pounds from my sleep system. If money was no object I could have saved more weight of course. I certainly couldn't buy 17 ounces of 750 fill down for $85.

