Improvements to a prior art collapsible wheeled caddy are disclosed to enable the caddy to be used for specialized purposes. A hinged lid is attached to the edge of the front panel to close the caddy top while lying proximate the front panel when open. The front panel can be recessed to receive the lid and preferably, arcs in the lid are dimensioned to accommodate the handles. The recess can accommodate one or more storage members, including a storage panel that have been dimensioned to be affixed within the recess. Hangers are configured to interact with the sides of the caddy to accommodate hanging items such as file folders. A back panel can be used containing retaining members to removably affix items to the panel. A stacking caddy is disclosed that has a handle recess and retaining member dimensioned to receive the wheeled handles. Caddy receiving channels are placed in the bottom of the stacking caddy to receive the edges of the wheeled caddy. A spacer unit can be used to stack two wheeled, or a wheeled and stacking, caddys incorporating wheel wells, alignment prongs and locks to prevent separation and lateral movement. A cover can be provided for one or more of the caddys to protect the contents A container case can also be affixed to the front or back panels of the caddy.