A rack for loading and accumulating bags comprises: a) a frame; b) a plurality of similarly sized shelves maintained in a horizontal position; c) said frame carrying similar shelves on an opposite side; d) tracks and a powered mechanism to rotate the shelves. After a first shelf positioned on a bottom portion of the first long side is loaded, it can be moved upwardly, generally concurrently rotating all of the shelves around the rack. All of the shelves can be thereby loaded from the portion position on a first long side. Lifting and carrying required to completely fill the rack is thereby minimized. Most preferably a shelf unloading mechanism is provided to push the shelf and/or bags loaded thereon off the rack; so that all of the shelves can be discharged therewith, by rotatably moving all of the shelves after each shelf has been unloaded.