I use the large ziplocs (the blue ones with the handle) for boms or any blocks that I have to transport that are 12 1/2". I cut a cardboard that's 13" sq, put it in, then slide the blocks in. It keeps them flat, clean and easy to carry. I also use bags to keep scraps separate. I write on the outside which quilt they go with. If I have several large pieces of fabric that I have a specific quilt in mind for I wrap them in a 4" wide piece of muslin that I've written the pattern name and book on then pin it closed. It keeps the fabric together and keeps me from using it on something else.