Abstract: A stationery accessory system comprises a slidable tab including indicia of contents contained in or demarcated by the stationery accessory system and a sheet-like member including a rail; one of the slidable tab and the rail having a channel defined along a longitudinal aspect thereof, the channel defined by a wall of the rail, and the channel having a longitudinal opening narrower than a width interior to the channel measured parallel to the longitudinal opening; and the other of the slidable tab and the rail having an expanded edge, the expanded edge having a width greater than the longitudinal opening such that the channel and the expanded edge are slidably engageable.