Disclosed is a device for temporarily creating and maintaining a depositing cavity in a container to be filled with objects, in particular flexible packages, standing substantially upright on the floor of said container, said device including: a moveable planar first restraining member with an
anterior surface facing into said cavity and a posterior surface; and a moveable planar second restraining member with an
anterior surface facing into said cavity and a posterior surface; the restraining members being operationally arranged to be removably insertable into and between facing side walls of a container to be filled with upright stacked objects and thereby to define a temporary cavity which facilitates the
insertion of the objects into the container. The cavity is defined, in an object receiving configuration, by facing anterior surfaces of said first and second restraining members, by facing side walls of said container and by a portion of the floor of said container delimited thereby, such that upon deposition a given object sits upon said portion of said floor and between said facing anterior surfaces. The posterior surface of said first restraining member acts to restrain previously deposited objects against movement. According to the invention so configured, following deposition of an object into said cavity, said first restraining member may be withdrawn from its position on one side of said object, and reinserted so as to take up a new restraining position on the opposite side of said object, and said second restraining member may then be moved away from said first restraining member thereby to create a new cavity for the deposition of a further object.