There are provided an information storage medium capable of real-time recordingplayback of digital moving picture information, and a digital information recordingplayback system using this medium. The retainer has an upwardly extending plug and is adapted to be inserted into an inner surface of the through-conduit. The shipping system also includes an information system having a shipper computer system configured to record and determine whether the delivery address of a package is an efficient destination for the first carrier. The plug locking assembly may further comprise a locking clip releasably securable within the housing.