I buy batting by the roll and hung it from my rafters as my sewing room is in the basement. As I acquire cutoffs from the quilts I make of various sizes, whenever I have the iron on, I'll add the scrap to another piece I've started piecing together. Then I hang it onto a hanger and write the size it is at that time. As I keep adding scraps to it of decent size by the time I need another batting, its already made or close to it. At times I'll have a couple scrap battings on hangers waiting to be used. The backing scraps goes into my "larger pieces" tote to be used in quilts. If the batting piece is too small to be used for a quilt, I'll determine if it can be used for a hot pad or place mat and put it into a special drawer I have for that size. Othewise it may get tossed if too small. I feel you can only scrap so many scraps together before it looks like more batting tape than batting.