In a class I took with Carol Doak several years ago, she suggested using a postcard, or the inserts you get in abundance in magazines when paper piecing to fold over the paper before sewing the next piece. She also uses plastic meat or similar type trays from the grocery store to hold cut pieces for paper piecing. I use Freezer paper when working with appliques, as well as using it for a pressing cloth when fusing applique pieces. In addition to qt. and gal. zip lock bags, I also use the very large, 2 1/2 gal., I think, zip lock bags to keep my projects separated, with pattern, fabrics, etc., so I'm less likely to lose pieces/patterns, etc. when I begin a fabric, hold a work in progress, or just keep everything together so I don't lose them.