Modular tray systems and methods of using the modular tray systems to support a variety of items either in a free-standing orientation or by securing the modular tray
system to a chair. Such a modular tray
system includes a tray and one or more features for supporting the tray with or from the supporting structure. The tray has a tray member, a base member connected to the tray member, an upper surface, a lower surface, and first and second connecting features defined in, respectively, the tray member and the base member at the lower surface of the tray. The supporting features include at least one of a support rod and a support throne that have third connecting features that are complementary to each of the first and second connecting features of the tray.