The smallest I save is 1-1/2" squares. I have plastic boxes full of squares 1-1/2", 2", 2-1/2", 3",3-1/2", 4", 5" and I use them as "leaders" and "enders" and it is amazing how much you can get done with the "inbetween" sewing. I also have boxes with strips 1-1/2", 2", and 2-1/2" and go into those when doing strip piecing. Anything smaller, or odd shaped that I do not want to deal with goes to my quilt guild "put and take" table.