Posted by: gstamer on Mar-13-13 10:57 PM (EST)
Here's someone else you might want to consider. The latest craze in the ultra-light world are quilts. They are like a sleeping bag, with a footbox, but the bottom is open to save weight (to use the insulation of your pad). The bags have no zipper (so no zipper snags), you drape it over you. Cords are provided to cinch the bag around you in colder weather. If you roll around a lot, you might have trouble with drafts, but I love mine.
I used an Enlightened gear Prodigy 40 degree bag (wide cut) on the Everglades Challenge this year. It weighs only 22 ounces. I was able to get my total camping load to under 30 pounds (not including water).
They make Prodigy quilts for 20 degrees, 30, 40 and 50 degrees. http://www.enlightenedequipment.com/product-category/prodigy/