Abstract: A panel system for exhibits comprises a plurality of upright rigid supporting members with generally planar members releasably connected on opposite sides to two adjacent supporting members. Each panel has an intermediate portion and along the two opposed edges are respective flange portions extending in opposite directions from said intermediate portion. This panel configuration enables the panels to be stacked in nesting fashion. Also provided are easily demountable header and lighting fixture subassemblies adapted to be affixed to the rigid members. Means are provided for detachably supporting horizontal rigid members upon the vertical rigid members and in other combinations as well.