A bag applicator assembly for a stationary packer assembly comprising a plurality of filling nozzles for filling valve bags wherein a valve bag comprising a valve selectively movable between a closed and an open configuration; the bag applicator comprising: a bag feeding device comprising a supporting plane configured for receiving a valve bag having the valve in a closed configuration; a valve opening device configured for cyclically moving between a first configuration of keeping the valve bag from the supporting plane and a second configuration of opening the valve and keeping the valve in the open configuration; a bag applicator device configured for picking up the valve bag from the valve opening device, for travelling from the valve opening device to a filling nozzle in a travelling configuration for avoiding bag interference with the filling nozzles and for releasing the bag at the filling nozzle.