A portioning and packaging apparatus and a portioning and packaging method. The portioning and packaging apparatus has a conveyor device for filling material which has a pump for producing a continuous volume flow, a filling tube which is connected to the conveyor device and which provides a supply of a tubular packaging case such that it can be pulled off the filling tube with the filling material which is expelled through the filling tube, a closure device which is arranged downstream of the filling tube and which locally constricts the filled packaging case to provide a tube end plait portion during the filling operation and closes a closure element around the tube end plait portion. The closure device also has a control device which produces a control signal for the constriction and closure operations on the basis of a selected portion size and the continuous volume flow and outputs it to a drive of the closure device.