A storage and order-picking system including: a floor storage for storing stacks, which are formed by objects stacked vertically on top of each other and which are stored side by side; a robot comprising a stack load-handling device gripping the stacks from the outside for transfer; characterized by: a conveyor system including a driverless transport vehicle; and at least one device, which is used on the conveyor system for densely storing and/or simultaneously transporting in a stable manner several ones of the stacks; wherein the device is configured to simultaneously receive several ones of the stacks, which are arranged side by side, wherein each of the stacks consists of a plurality of the objects, which are stackable vertically on top of each other, and wherein the device comprises: a frame; and a plurality of load-handling platforms; wherein each of the platforms is configured to receive exactly one of the stacks, and is connected to the frame such that the plurality of the platforms is movable between a first open position for loading and unloading and a second closed position for transport; and wherein the driverless transport vehicle comprises the device arranged on an upper surface of the transport vehicle. a floor storage for storing stacks, which are formed by objects stacked vertically on top of each other and which are stored side by side; a robot comprising a stack load-handling device gripping the stacks from the outside for transfer; characterized by: a conveyor system including a driverless transport vehicle; and at least one device, which is used on the conveyor system for densely storing and/or simultaneously transporting in a stable manner several ones of the stacks; wherein the device is configured to simultaneously receive several ones of the stacks, which are arranged side by side, wherein each of the stacks consists of a plurality of the objects, which are stackable vertically on top of each other, and wherein the device comprises: a frame; and a plurality of load-handling platforms; wherein each of the platforms is configured to receive exactly one of the stacks, and is connected to the frame such that the plurality of the platforms is movable between a first open position for loading and unloading and a second closed position for transport; and wherein the driverless transport vehicle comprises the device arranged on an upper surface of the transport vehicle. a conveyor system including a driverless transport vehicle; and at least one device, which is used on the conveyor system for densely storing and/or simultaneously transporting in a stable manner several ones of the stacks; wherein the device is configured to simultaneously receive several ones of the stacks, which are arranged side by side, wherein each of the stacks consists of a plurality of the objects, which are stackable vertically on top of each other, and wherein the device comprises: a frame; and a plurality of load-handling platforms; wherein each of the platforms is configured to receive exactly one of the stacks, and is connected to the frame such that the plurality of the platforms is movable between a first open position for loading and unloading and a second closed position for transport; and a frame; and a plurality of load-handling platforms; wherein each of the platforms is configured to receive exactly one of the stacks, and is connected to the frame such that the plurality of the platforms is movable between a first open position for loading and unloading and a second closed position for transport; and wherein the driverless transport vehicle comprises the device arranged on an upper surface of the transport vehicle.