A system uses a plurality of sensors to detect and manage conditions within a moving pocket, such as a pocket carrying a flat product from one location to another. The system is particularly useful in connection with a newspaper insert machine. One sensor detects whether the product has been opened properly at a particular time; another sensor detects whether the product has been properly gripped by a gripper at a particular time; another sensor detects whether the pocket is empty at a particular time and another sensor detects whether the pocket is open or closed at a particular time. In the event an error condition is detected, the error condition is corrected by a control system.