I agree with the folks who talk about using the scraps from trimming the backing after you have quilted it. I often take the part I trim off and turn it into the binding. actually I like using it because most of the time, I don't have to join as many cross cut strips as the backing is longer ...when I long arm. I will leave the shelvage on the backings where they get pinned to my leaders...then I start quilting as clos to the leaders as I can get. So often I have quite a bit of fabric left that I can get a couple of strips of binding from.