A gripper for manipulating containers includes a support on which a cam mechanism is pivotally mounted. The gripper has a first jaw operated by the cam mechanism and a second jaw controlled by the first jaw. The first jaw has an actuator which interacts with a receiving mechanism on the second jaw for opening or closing the gripper. The actuator is pivotally associated with the first jaw so that, when force is applied by the receiving mechanism due to rotation of the second jaw relative to the first jaw, the actuator can rotate relative to the first jaw to allow the gripper to open.