Abstract: The present invention provides a detent mechanism adapted to be mounted on a container which is to contain one or more articles, notably CD cases, which container has an access aperture through which the article(s) can be inserted into or moved from the container. The detent mechanism is adapted to retain the article within the container and is formed from a mounting member adapted to be carried externally in the container, preferably at or adjacent the access aperture of the container. A latch member is adapted to be carried externally of the container by the mounting member and is movable between a retracted position at which at least the distal end of which is adapted to retain an article within the container. The latch member is also movable to a extended position in which latch member permits removal of the article through the access aperture by being located out of the line of travel of the article as the article is withdrawn from the container.