Document storage trays are disclosed that may be stacked in at least two different configurations including a “nesting” stack where an upper tray fits within the storage area of a lower tray and, in turn, is also able to receive a tray within its own storage area so that multiple trays can be stacked nested together. The document storage trays may also be stacked in a vertical configuration and the trays include appropriately placed slots, detents, bosses and legs for a stable vertical stacking configuration so that multiple trays may be stacked one on top of another and form a stable structure. At least one embodiment further enables the trays to be stacked in a cascaded form so that front edges of the trays are staggered laterally from the bottom tray to the top tray. At least one embodiment includes a built-in collating function so that each tray is able to receive documents from one of two different and perpendicularly oriented sides.