Abstract: Apparatus for the automated transfer of contents between a rubber diaphragm port-type vial and a flexible, collapsible bag for medical solutions, which bag has at least one needle-pierceable access port. A double-pointed hollow needle is positioned so that the vial is held with its rubber diaphragm facing one pointed end of the needle and the medical solution bag is held with its needle-pierceable access port facing the other pointed end of the needle. Apparatus is provided for bringing the vial and bag into needle-penetrated relation, to provide flow communication therebetween through the hollow needle. Means are also provided for compressing the bag to force liquid from the bag into the vial, and for releasing the compression to allow the liquid to flow from the vial back to the bag. As a result of this, the original contents of the vial may be carried into the bag in automated manner.