This weekend as I was pinning quilts for machine quilting I thought I should pass this tip on as it really works for me. I have three - six foot tables that I set up in my basement. I put the backing fabric on the table and hold it in place with clamps you put around your pant legs when riding a bike or to keep a quilt rolled up for machine quilting. (I never liked them for keeping a quilt rolled up for quilting.) I put one end of the clip under the table and the other end of the clip on the top of the table holding the backing in place. I then put down my batting, putting the edge of the batting under the clips. This keeps the backing and batting tight and straight. I then lay my quilt top down. Depending on the size of my top, I can either put the top under the clips or just spread it out and it stays in place as I am pinning my quilt. Works great for me - I hope I explained it well enough.