Need to make removable bag neck collar

I wonder if you could build the collar into the quilt, so it would fold over into the neck of the bag. That would help stabilize the quilt too.

"I wonder if you could build the collar into the quilt…"

+1

… and limit the amount of air flushing/bellowing/moving between the two.

Dale, you are so smart it makes me sick. (Usually I only make myself sick by "smartness", often mistakenly called "smartassedness" by my wife.)

I may well just make TWO removable collars like that, one for the bag and a longer one for the quilt. I still need one for the bag in sub-freezing temps when I don't carry the quilt. This I know from sad experience.

I made a horseshoe collar for my WM Apache years ago. Synthetic fill, because working with down was a bit too intimidating for me. The collar didn't attach to the bag, but rather velcroed to surround my neck. Think Victorian Queen Elizabeth. I was sick of wrapping my jacket around my neck at night. The top baffle is supposed to be cut larger to act as a collar-total gimmick. I'm certain you could do the same using down.

With a winter bag system now, the collar was repurposed into a pillow for our child carrier backpack.

I've bought down from http://wildernesslogics.com/DIY-MATERIALS_c28.htm

Working with down is not that difficult

But, for a collar, it's small enough weight difference wouldn't be important