A modular shelving assembly for use in a vehicle, including a cargo space at least partially defined by a floor and a side wall of the vehicle, includes at least two interconnected upright assemblies. Each of the upright assemblies includes a first panel, a second panel, and a coupler member unitizing the first and second panels. The modular shelving assembly further includes a rail secured to one of the floor and the side wall to which at least one of the interconnected upright assemblies is anchored.