Apparatus and method for filling bulk materials into open-mouth bags, including the following steps: a) an open-mouth bag is appended from beneath to a filling spout of a filling station by way of an at least partially upwardly motion, so that the bottom end of the open-mouth bag is freely suspended; b) the filling process is started and bulk material is introduced into the open-mouth bag so that the freely suspended bottom end of the open-mouth bag unfolds; and c) the filling spout is lowered, so that the unfolded bottom end of the open-mouth bag is supported.