A collapsible file organizing assembly retains flat items in an organized disposition through vertical arrangement of tiered, sloped shelves that organize item. A pair of side frames carry panels, channels, crossbars, and fastening mechanisms. The panels easily disassemble and collapse for stowage. The side frames have a top bar, a bottom bar, a straight lateral bar, and a bent lateral bar. A plurality of sleeves join with the straight lateral bar so that a rear panel can be slidably pulled out or into the sleeves. A base panel forms the lowermost surface of the assembly. A plurality of channels extend between the straight lateral bar and the bent lateral bar at an angle. The channels provide a slidable surface that receives shelves. The shelves slidably engage the channels to form a tiered, sloped arrangement. A rear shaft on the shelves abuts against rails disposed along the rear panel.