If you've lost the Lensbaby Optic Swap Tool/Container that came with one of your Lensbaby optics, simply replace it with this clear plastic container that also acts as a protective rear cap.
Use the prongs on the bottom to remove 37mm threaded optics including Creative Aperture, Double Glass, Single Glass, Plastic, Pinhole/ Zone Plate, Soft Focus, and Fisheye Optics.