I use sheets for backing all the time and have never changed anything on my mega quilter. I shop thrift stores and keep a supply on hand. They work great on family quilts and 2.00 a sheet sure beats the price of fabric on my very limited budget. If i didnt i would have a pile to be quilted cause couldnt afford backing. Many quilts i have gifted did not even realize the back was a sheet. Sometime I machine appliqué extra blocks to them to add interest and never had problem there either.