I agree with keeping the boxes small. I learned years ago to pack everything in boxes I could handle alone. I keep fabric in plastic boxes on shelves by color. The fabrics have been in there for 20 years and are fine. They are in the air conditioned house so there's not a problem with mold or mildew and they do get opened, but some of them have only get opened every 4 or 5 years beause they aren't fabrics I used in my every day sewing/quilting.