What size atmos, the 50? I always stuffed the quilt in a large sack half compressed and then added gear around it, Ray Jardine style. If the quilt doesn't fit in your pack, you either have the wrong pack or the wrong quilt. Depends on how you want to look at it.
_________________________
"In the beginner's mind there are many possibilities. In the expert's mind there are few." Shunryu Suzuki

http://hikeandbackpack.com