A packet includes a cavity containing flowable material and a sealed perimeter portion that defines the cavity. The sealed perimeter portion includes a header portion and a connector tab. An aperture is established through the header portion. The connector tab includes a neck portion and a retaining portion, which has a wider cross dimension than the neck portion. The retaining portion, when inserted through an aperture of a product or another packet, limits retraction from the aperture to join the packet with the product or other packet. A display system includes a plurality of such packets, whereby the retaining portion of a first packet may be collapsed and inserted through an aperture of a second packet, whereby the retaining portion, when expanded to its initial state, limits retraction from the aperture of the second packet to join the first and second packets together.