Originally Posted by
BigAura
I like down bags for warmth, weight, and compressibility. Down bags are always lighter & more compressible vs synthetic for the same warmth value. The downside is price. High-end down is expensive. I bought my in a closeout sale at REI. My twenty-five-degree bag is 825 grams (29 ounces).
You may be technically correct, but check out the latest generation of Primaloft sleeping bags. I don't think the weight difference is significant. I'll take a 2-3 oz. weight penalty for the advantages that synthetic bags and jackets offer over down.
Here again it is all a matter of preference. I've used down bags for years mountaineering, and still have a couple in the closet. Once good synthetics came out we made the switch.