Perimetrically tensioned flexible signage mount

A signage mounting system comprising:

• a) a movable container, having an interior and an exterior, adapted to house material in the interior of the container for transport, the container having an access door that is openable to provide an opening into the interior of the container to admit the material, the door being closable for transport of the container, so that the door has an open position and a closed position;
• b) a flexible signage sheet removably mounted on the exterior of the container covering an external container surface, so that the signage sheet has an interior sheet surface facing the external container surface and an opposing exterior sheet surface facing away from the external container surface, the exterior surface of the signage sheet bearing visible symbols;
• c) a variable length tensionable support line, perimetrically attached to the signage sheet, drawing the signage sheet flat over the external container surface;
• d) a plurality of support line catches attached to the container, the catches removably engaging the support line, so as to hold the support line and the signage sheet on the container when the support line is in a tensioned state, and so that the catches release the support line and the signage sheet from the container when the support line is in an untensioned state;
• e) a support line length adjustment mechanism adapted to be actuated to alternatively:
• i) shorten and thereby tension the support line on the catches, so that the support line is in the tensioned state fixing the support line on the catches, and
• ii) lengthen and thereby untension the support line on the catches, so that the support line is in the untensioned state releasing the support line from engagement with the catches;
• and,
• f) wherein the support line length adjustment mechanism has a fixed attachment to a first end of the support line and a releasable attachment to a second end of the support line.