The main questions with batting are how will the quilt be used, do the batting and the top/back match for washability, the thickness desired and how it will be quilted or joined together. I have used thin blankets with success. I have cut some apart for placemats as they are thin, will not wrinkle after being washed and I machine quilt them. It might be hard to hand quilt through a blanket. You can test this, if this is your preference, by laying fabric on top and bottom for a pretend sandwich and trying to sew through the layers. I hope this answers your question.