Abstract: There is disclosed a checkout system for use in a supermarket or other retail merchandise store or the like. The checkout system includes a stand alone label scanner device for scanning data bearing labels on the merchandise items and a bag supporting cart pivotally secured at one end to the floor adjacent the scanning device for supporting bags in an open position to receive merchandise items. Associated with the bagging cart is a counter shelf member pivotally attached to the cart. Slidably mounted on the shelf member is a shelf extension member. In one mode of operation the cart is positioned adjacent the discharged end of the scanning device to allow the checkout operator to move in one motion the merchandise items past the scanning device and into a bag located on the cart.