Abstract: A package for a stack of optical disks has two spaced apart endcaps, each endcap defining a central protrusion portion, a middle portion, and a lip portion. A plurality of ribs extends radially outwardly from the protrusion portion through the middle portion and terminates at the lip portion. A central portion of each end disk of the stack is engaged with the central protrusion portion of a corresponding endcap. The lip portion surrounds at least one optical disk at each end of the stack. The stack is retained between the endcaps in a package by a wrapping material mounted about the stack and extending to portions of exterior surfaces of the endcaps. In a second embodiment the package includes a spindle member.

Abstract: An instant-processing film unit of the preregistered, integral type includes an internal dark slide which protects the unit from exposure prior to use. The film unit includes a photosensitive element and a cover sheet between which the dark slide is removeably positioned to shield one side of the photosensitive element from light. Exposure from the other side is prevented by an opaque layer in the element itself. When used with an opaque processing composition, the unit can be handled in daylight, without fogging, both before and after exposure. The film unit is adapted for use in commercially available adapters for professional type cameras.