Just googled these to see what they look like - there's a variety, but in common they all must have a ring or similar opening to hook onto the zipper. I would probably punch 2 small holes in a piece of cardstock and hook the "ring" through the holes (if possible), then put that into a cello bag with a topper.
Alternatively, you could attach one to a zipper for display, and just have the rest bagged up.
I'm into bottlecaps, so I may have to consider this idea for my stalls!!