I know you said you don't want double rows but that is what I did in my fabric cupboard. I put all my fabric on boards so they are upright and I put the same colour family behind the first row. When looking for a colour, I just move the first row off the shelf to check behind it. I do have one shelf that I have my fabric bolts behind a row of the mini bolts. It works fine for me and I can shut the doors on my cupboard to keep my fabric dust free and out of the daylight.