I went to the Quilt Expo in Madison, WI in Sept and while there I listened to an appraiser. She said the only true way to determine that a feed sack was a feed sack was to see the holes. Fabric was sold off the bolt as well as just feed sacks according to the appraiser. I asked her how to show that on a quilt since I really didn't want needle holes in my quilt. She suggested we use the part with holes as an outline on our labels or make a small envelope on the quilt back and put some of those pieces with holes inside...I liked this idea best because if you ever had to do a repair you would have little fabric pieces to do so. I find feed sacks at estate sales if I am really lucky. Also, on Ebay and at antique shops. Since I prefer '30's quilts they are what I love to work with.