A holder for flat objects according the invention includes an endless belt made of a flexible sheet material, wherein an end portion of the belt is folded into itself forming an inner bend and an outer bend with the inner bend disposed inside of the outer bend. A set of first and second support rods are disposed side by side in parallel to each other, the first rod at the bottom of the inner bend and the second rod at the bottom of the outer bend. A pair of third and fourth rods extend through parallel endwise openings in the belt between the inner and outer bends, which third and fourth rods are disposed side by side in parallel to each other with the belt is wound over the third and fourth rods so that the belt can slide over the third and fourth rods, whereby movement of the first rod away from the second rod causes sliding movement of the belt over the third and fourth rods. In a preferred embodiment an inside surface of the belt is attached to one or both of the first and second rods.