Abstract: A media-disk case has an envelope having spaced front and back walls forming a cavity opening at an edge formed with a cutout, a plastic pin extending along an axis in the cavity and having ends fixed adhesively to the walls, and a plastic insert formed with a seat adapted to hold the disk, with a thickened edge region, and with a hole traversed by the pin. The insert is fittable in the cavity and pivotal about the pin between an open position largely outside the cavity and a closed position contained in the cavity and with the edge region fitting in the cutout. A plastic stop adhesively fixed to the walls in the cavity offset from the pin is closely juxtaposed with and bears on the insert in the closed position. A frangible plastic web is unitarily formed with the stop and with the insert. The insert can only be moved from the closed position to the open position on rupturing of the web.