I will mostly be in Tennessee in the Smokies or Big South Fork or South Cumberland mostly. The Smokies would be the only place of any real elevation and that would only be 5-6k at the most.

Thanks for the ideas so far. I also have a 35 degree REI down bag that weighs 1lb. 3oz. I may just take it and use it unzipped like a quilt. It would be about as light as a small fleece blanket and probably the same size stuffed.