Originally Posted By OregonMouse
My 20* sleeping bag (WM Ultralite size short) weighs only 25 oz. I'm not to sure why I'd want to double the weight to add maybe 10*.

Why not add a few ounces more down instead? Or wear your insulating clothing inside the bag? Or, ir it's below freezing, try a vapor barrier?


If there is a reason, it may be...

If you're a hammock camper:
-You may have a very warm underquilt, but no top quilt and you want something over top to trap the heat in. A liner could potentially be lighter or more compact than having extra clothing.

If you're a ground dweller:
-You may have no sewing skills/equipment.
-Money may be more important than weight right now.
-You may not like vapor barriers because you sweat a lot.

If these situations aren't the case, I think your ideas are the way to go, OregonMouse.
_________________________
"Without craftsmanship, inspiration is a mere reed shaken in the wind." - Johannes Brahms