Great thread as I have often thought of this.
Why not take the zipper out of the sleeping bag, or at least leave 3 feet on the bottom for a foot box? Seems like I wouldnt want a cold zipper touching my side in the middle of the night.
I am hoping to find one that I can tinker with - take the zipper out. Remove the head from the draft tube, and use elastic fabric to attach it to the ends, so I can slide it under my head, while having the body of the sleeping bag on top of me. I have even thought of making the head piece into the shape of an L:, so I would add an additional section of down with a compressible foam backing so have a pillow during side sleeping.
Thanks for the info.
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