A method for filling a bag with a liquid additive, for storing the additive in the bag (10; 10.1, 10.2) and for dispensing the additive from the bag (10; 10.1, 10.2), respectively under aseptic conditions, with at least two connections (12, 14) arranged on the bag (10; 10.1, 10.2), with means for mounting the bag (10; 10.1, 10.2) in a mounting position, which is positioned such that a gravity-side supply of the additive to one of the connections (12, 14) takes place, and with a dispensing arrangement, which is connected on one side with one of the connections (12, 14) for the purpose of dispensing the additive from the bag (10; 10.1, 10.2) and can be connected in a fluid-accessible manner as needed, and which on the other side leads into an injection needle (100.5) for dosing into a base product, wherein the bag (10; 10.1, 10.2) and the dispensing arrangement are already sterilized as one unit before the filling of the bag (10; 10.1, 10.2) with the additive, characterized by the following steps a) through i): a) the bag (10; 10.1, 10.2) and the dispensing arrangement connected with it via the second connection and fastened on it are inserted in the sterilized state, with respect to the mounting position, first with the upper end of the bag into an outer packaging bag that is open on one side and that serves as an outer packaging; b) the arrangement made up of the outer packaging and the bag (10; 10.1, 10.2) is placed while fastened in an inclined position such that the first connection represents the high point of the arrangement; c) the bag (10; 10.1, 10.2) is filled with the liquid additive via the first connection; d) after the complete filling of the bag (10; 10.1, 10.2), the first connection is heat-sealed; e) the outer packaging bag is hermetically sealed in full around the bag (10; 10.1, 10.2) through the heat-sealing of its still open side; f) the outer-packaged bag (10; 10.1, 10.2) is supplied to a dosing apparatus, removed there from the outer-packaging bag and positioned in its mounting position in the dosing apparatus with the means for mounting, which is designed as a three-point mounting; g) the injection needle (100.5) on the discharge-side end of the dispensing arrangement is brought into its dosing position under aseptic conditions; h) chronologically just before the dosing of the liquid additive into the base product flowing in a line, a fluid-accessible connection between the interior of the bag (10; 10.1, 10.2) and the dispensing arrangement is established through the irreversible breaking of a barrier at a predetermined breaking point in a kink valve arranged in the second connection; i) the liquid additive is forcibly delivered from the bag (10; 10.1, 10.2) to the injection needle (100.5) through means acting on the dispensing arrangement from the outside. a) the bag (10; 10.1, 10.2) and the dispensing arrangement connected with it via the second connection and fastened on it are inserted in the sterilized state, with respect to the mounting position, first with the upper end of the bag into an outer packaging bag that is open on one side and that serves as an outer packaging; b) the arrangement made up of the outer packaging and the bag (10; 10.1, 10.2) is placed while fastened in an inclined position such that the first connection represents the high point of the arrangement; c) the bag (10; 10.1, 10.2) is filled with the liquid additive via the first connection; d) after the complete filling of the bag (10; 10.1, 10.2), the first connection is heat-sealed; e) the outer packaging bag is hermetically sealed in full around the bag (10; 10.1, 10.2) through the heat-sealing of its still open side; f) the outer-packaged bag (10; 10.1, 10.2) is supplied to a dosing apparatus, removed there from the outer-packaging bag and positioned in its mounting position in the dosing apparatus with the means for mounting, which is designed as a three-point mounting; g) the injection needle (100.5) on the discharge-side end of the dispensing arrangement is brought into its dosing position under aseptic conditions; h) chronologically just before the dosing of the liquid additive into the base product flowing in a line, a fluid-accessible connection between the interior of the bag (10; 10.1, 10.2) and the dispensing arrangement is established through the irreversible breaking of a barrier at a predetermined breaking point in a kink valve arranged in the second connection; i) the liquid additive is forcibly delivered from the bag (10; 10.1, 10.2) to the injection needle (100.5) through means acting on the dispensing arrangement from the outside.