Originally Posted by
Doug64
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.
I might try at some point. Washability is the other negative (besides cost) for down, on my checklist. Cost of my down bag is already covered. But a synthetic might be possibility for a very-long tour where multiple cleanings on the road are in the mix.
To date my longest tour has been 105 days and I did wash my bag midway(ish). It did take awhile and I'm sure not as simple as a synthetic.