I used post-it flags and stapled them to the salvage in a corner- folded so that corner was up, easy to find. I also arranged my shelves with1/2 yard, one yard, two yard, three yard and wide backings stacks sub organized by color. I always use wide backing and know those are 3 yards long, ( 108” square) so when I find a good sale I might purchase 3-4 different backing fabrics.