A file cover has paper-penetrating prongs which are secured in the assembly by engagement with a mounting channel and at least one of which is slidable along the channel whereby the spacing between them is infinitesimally adjustable. A retainer for each prong is preferably an apertured block borne by a parallel channel member, at least one of the blocks being slidably movable in the parallel channel member.
A container for removably storing an article such as a video game, and for securing sheet material to the container, such as the instruction booklet for the video game, to prevent separation of the booklet from the container. The container has a base and a pivotally mounted lid which forms an internal storage compartment with the base. A hinge assembly having an elongated panel and pair of hinge strips pivotally mount the lid on the base. A holder bar is secured to the hinge panel. A pair of flexible straps are provided at the ends of the holder bar and form a pair of loops which extend into the storage compartment of the container when the lid is closed on the base. Other ends of the straps extend through holes formed in the booklet to mount the booklet on the straps, after which the ends are snap-fitted through locking holes formed in the holder bar to permanently secure the booklet on the loops within the container.