a device one version of which comprises a planar member having a top surface and a bottom surface , wherein the top surface defines an array of recesses configured for substantial alignment with an array of blister - like chambers in a sheet to receive a plurality of objects . all of the recesses defined by the planar member are substantially uniform in size and each recess is sized and configured so that substantially all of at least one of the objects may fit in a respective recess . the planar member also defines a plurality of fluid passageways , each passageway opening respectively into one of the recesses defined by the top surface of the planar member , at least a portion of each fluid passageway being more narrow in cross - section than its respective recess to retain the object in its respective recess . related vacuum apparatus employing the device is described .