I am looking for a sleeping bag for temperatures down to about 0F. Any advice on whether I should go for a slightly lighter bag and increase layering or go for a "true" winter bag rated to 0? I currently own a Mountainsmith Wisp, which probably would not work even with considerable layering.
F.e, should I go for a true winter bag such as the Western Mountaineering Antelope super, Montbell down hugger #0 or Mountainsmith Cypher, or choose bags rated 10-15, such as the Western Mountaineering Versalite Super?
Thanks for your advice!