Someone had a great idea that I used:
3 ring binder with clear page protectors.
Slit the inside and bottom seams of the clear plastic and fold out on the panto. Trace with permanent marker then put in the binder. Great way to keep together and pull out the clear pages to lay on quilt top to "audition" the design. Took a little time, but it'seems really useful now! (probably lay the side on the quilt top without the marker, but I haven't had any issues). Easy to add to when you get new pantos. I even traced a section of my CL boards to put in my binder?! Oh, then I just store my pantos and boards in a cupboard out of sight.