Provided is a toner having excellent blocking resistance and flowability. The condition detection program is further programmed to issue a reminder alert if the condition or status is not detected. The reminder device is coupled to the detecting device, and is used for referring to the detecting result to determine whether to provide a reminder of performing a channel recall operation. In an exemplary embodiment, the containers are stackable such that a plurality of containers can be used to build a complete free-standing sales exhibit.