An expandable folder includes a plurality of panels rotatably coupled to one another, and a number of sliding mechanisms slidingly coupled to a number of grooves defined in the panels. Engagement of the sliding mechanisms between groves defined in adjacent panels secures the adjacent panels in a planar orientation relative to one another.

According to various embodiments, a document storage tray includes a tray body and a document panel defining a document storage region. The tray further includes two internal alignment rails disposed in the interior of the tray body. The internal alignment rails are configured to facilitate an alignment of documents that are stored in the document tray via a plurality of alignment rods coupled to the rails and a plurality of document storage sleeves, configured to receive and house documents. A document stored in the document tray may be viewed, read, or accessed without requiring removal from the document storage tray. In this way, the embodiments may save the user time and allow the user to store and organize documents in a manner that will preserve the organization when the document is viewed or read.