Abstract: A process and apparatus for the injection-extrusion blow molding of a hollow tubular plastic product useful as a liquid container or the like, and which includes the steps of injecting a predetermined amount of the thermoplastic resin into a tubular cavity so as to form a tubular first preform having a closed end, and then axially extruding the tubular first preform so as to extend the bottom end and form a hollow second perform. The second preform is then blow molded outwardly against the internal surface of a blow mold to form a bioriented finish product. The first preform may be heat conditioned prior to the step of axially extruding the same, and the blow mold may be provided with an axially moveable bottom wall which permits a finished product to be formed having a substantially uniform wall thickness.