a packaging device for individual containers comprising a cardboard , plastic material or similar blank with a surface formed with orifices through which the containers pass and grooved along two continuous or discontinuous lines defining two strips , which , after bending form two short parallel flaps with tongues coming from the orifices in the blank and adapted to be erected therefrom opposite the flaps , the containers -- held in the orifices -- are further supported by the flaps or the tongues bearing under an external projection of the containers , which tongues act in the manner of buttresses or stays , by bearing on a zone of small extent of the projection , and the total height of the tongues and flaps by which the device may rest on a display surface or any appropriate support is substantially equal to the height of the containers .