About 3 or 4 years ago, I had 6 large packing boxes full of scraps. I spent about 2 weeks trimming them into useful sizes and shapes, precutting for specific projects and generally reducing the total to 2 boxes. I was surprised to find that the majority of pieces was not suitable even for my applique projects. Over the next few months, I made about 10 scrap quilts. I am now much more careful about what I save. Of course, my stash hasn't really gotten any smaller, merely more organized with more "good" fabric. One thing I decided to do was to cut 2.5" squares. When I want to sew but don't feel up to anything challenging, I make 4 patches, which tend to be "filler" bits because they are already made. One advantage is that a gallon baggy of 2.5" scraps takes much less space than the scraps from which I cut them. My other categories were 5", 5.5" 6" squares. 2.5 x 5.5 (with the 2.5 and 5.5, this makes my fav scrap quilt, Vestibule, or Star in the Corner.) My last category is "long, skinny", a category of even widths, rather like jelly rolls. These must be at least 1.5" wide. I roll these individually and baggy them too.