Abstract: A three-deep low profile push-back rack maximizes head space in a vertically stacked series of storage bays. A first pair of tracks extends longitudinally through the bays supported by the rack. The middle bay contains a second pair of tracks parallel to the first tracks. The second tracks are spaced apart a distance which is greater than the spacing of the first tracks and are mounted on the outside of the first tracks. A first flat pallet truck rolls along the first track. A lower second cart having a U-shaped frame has a front pair of wheels rolling on the first track and a pair of rear wheels rolling on the second track so that a clear nesting space is provided within the center of the frame of the lower second can to accept and receive the higher first cart. A low profile is provided to maximize head space because the frame of the higher cart does not have to roll over the top of the second cart, it only has to fit within the nesting area slightly above the loading surface of the lower cart.