Down Sleeping Bags are the best for cold weather. I am looking at the Montbell U.L. Super Stretch Down EXP Hugger Sleeping bag -20 Degree Down. The sleeping bag keeps you warm without a lot of weight. It is made with multi-box construction and has 800 fill down in the smaller compartments to maintain loft. Stretch seams to let you move freely while reducing space to keep you warm and has draft tube to prevent air from circulating through the zipper and a draft collar to keep air out of the top. It is made to keep you warm in the winter time.
