Hi...I have just reorganised my room (posted picures under So happy ..)and I wanted all my fabric sorted just like you because I had seen others with it looking great.
I ended up buying some Artist Mounting board (the stuff that boarders a picture in a frame). I cut one piece 18 x 51/2 to use as a folding guide (the cupboards were just too small to have 18x6 which I could have done round a ruler !) and then I cut the rest of the card into 12x 5 to make mini bolts. It was really easy to cut with my rotary cutter (blade will be useless afterwards though)......as the cardboard is used for paintings I thought it must be fairly safe........someone please tell me if it's not !