Abstract: Adjustable package flow stop wall systems and associated methods may operate as part of package processing stations, in order to facilitate accumulation and transfer of packages from inbound collection areas to outbound conveyances. For example, an adjustable package flow stop wall may include a wall assembly, a frame assembly, a pedal assembly, and/or a handle assembly. The wall assembly may selectively extend above the upper surface of a station between a plurality of positions, e.g., a closeout position, an active position, and a flush position, and the pedal and/or handle assemblies may be actuated to cause movement of the wall assembly. Further, the adjustable package flow stop wall may include one or more sensors, actuators, and/or input elements to enable movement of the wall assembly at least partially or fully automatically, which movements may be based on detected agents and/or packages and associated characteristics.