BUMP –
After using my LL Bean -20 F. bag last winter (9,000+ ft. at -10 F.) I’m very happy with it.
What struck me the most was the excellent design of the separate collar and hood elasticized draw strings and captive toggle keepers. And the Velcro closures for both the zipper side of the collar and the hood have extra fold-over Velcro flaps in case you don’t want to use them on a warm night. These flaps keep the scratchy “male” Velcro pads from irritating you. And the hood Velcro flap even has its top edge covered by a thin “fleece” chin guard. Amazing. All winter bags should be this well designed.