Ray Jardine has been an advocate of quilts for at least 15 years. Check out his ideas at http://www.rayjardine.com/. I have made and used several quilts. I prefer them for mild weather but have used them to temperatures in the mid 20's but not comfortably. If I had to choose between a quilt and a sleeping bag, I would choose the sleeping bag for almost all conditions. If you have a sleeping bag with a full length zipper, you have a quilt. But, it doesn't work the other way.