I ask the clerks at Joann's for their empties; I can get four mini bolts out of one full size (I cut them no taller than 11" so they will fit in my bookcase. If I have a lot of yardage of one fabric, I fold it as if it were on a full size bolt and then hang in with one of those skirt hangers or put it on a full size bolt at store it on the shelf. Some would say storing it on cardboard is not a good thing but I have had no ill effects. My fabric is sorted first by type, quilting cotton, flannel, fleece, knit, denim, etc. Then sorted by color, whites fad to tans, and on to browns. Greens are together then blues; reds and purples and blacks. Specialties (holidays) are put together in one of those zippered linen bags (I don't have much of that). If I have made a purchase for a special project, I keep those together on the shelf or in a storage box.