Abstract: A container assembly includes a container, a collection arm assembly, a locking mechanism, and a controller. The container has a front wall, a rear wall, a first sidewall, and a second sidewall cooperatively defining an internal cavity. The collection arm assembly is slidably coupled to the container such that the collection arm assembly is selectively extendable laterally outward from the container. The collection arm assembly includes a retaining pocket. The locking mechanism includes a latch and an actuator. The latch is positioned to selectively engage with the retaining pocket of the collection arm assembly. The actuator is positioned to selectively reconfigure the latch between an unlocked position and a locked position. The controller is configured to engage the actuator to selectively reconfigure the latch into the locked position and thereby prevent the collection arm assembly from extending laterally outward from the container.