There is presented a device and method for filling and advancing a series of containers including a first container and a next container. The device includes first and second assemblies having first and second restraining members respectively. The assemblies are positionable relative to each other in an object- receiving configuration in which the first restraining member and the second restraining member are inserted into the first container, and at least partially define a gap therebetween for deposition of an object. They are also positionable in a transitional configuration in which the second restraining member is raised relative to the first restraining member, and a lower portion of the second restraining member is positioned above and behind a leading internal face of the next container; and a container advancement configuration in which at least part of the second restraining member is in contact with and applying an advancement force to the leading internal face of the next container.