Abstract: A back pack includes a case made from an impact resistant hardened plastic material. The case has an exterior surface with regions of increased plastic thickness which are provided with receptors to releasably attach articles to the exterior surface of the case.

Abstract: A permanently fixed theater construction comprises a ground level lobby and a projection screen which are opposite ends of the construction. A seating region on a support floor is angled downwardly from the lobby into a pit towards the projection screen. An entrance to and an exit from the seating region are both provided at floor level through the lobby. There is a projection room with a projector in the lobby and the projection room includes a projection window above floor level of the lobby facing the projection screen. The projector itself is movable from a first set up and maintenance position at the floor level to a second operating position level with the projection window. The projector when moved to the operating position projects large format film to the screen.