My dad and I try to go hiking in Great Smoky Mountains National park every summer. Next year we want to hike the AT through the park from Fontana Dam to Davenport Gap. Currently we have lightweight fleece blankets with zippers and straps that we use as sleeping bags/quilts. I want to start cutting down on weight for this upcoming trip. I am looking for a bag/quilt or other solution that is lighter than a fleece blanket but will still keep us warm at night in July. Does anybody know of a good cheapish bag?