I am often asked how I carry my projects when I travel. I have what I think is a very good system. I start with a plain sheet of paper, folded in half. I cut a piece of flannel 5 1/2" x 8 1/2" and place it inside the folded sheet of paper. I place my applique pieces on the flannel in a sloped stack – being sure to place the applique pieces in order so that #1 is on top and the last piece is on the bottom.
In the photo above you can see my paper 'folder' on the left. Once you close the folder, the applique pieces are covered by paper. The flannel keeps the pieces in place and everything stays nice and flat. The folder fits neatly inside a gallon sized zip bag, along with the block background, the overlay, a small pin cushion, bobbins, and scissors. I carry my sandpaper board separately.
I make a "folder' for each block and border in a project. You can write on the paper if you want to, labeling it with pertinent information. I save and re-use these folders as I finish one quilt and move on to another.