Abstract: An adjustable film forming apparatus for receiving unfolded film and forming the unfolded film into a tubular form for packaging different sizes of articles. An angled guide rod receives respective portions of the web to form a flat bottom and cooperating with an angled member mounted above the flat bottom forms the top, closed side and opposite open side of the film tube for receiving articles to be packaged. An adjustable film forming table receives the flat bottom portion of the web. Self-positioning means are provided to floatably mount one end of the angled guide rod so as to reposition the guide rod in conformance with changes in the angled member to accommodate different article heights. A side sealer packaging machine with an in-feed conveyor, adjustable film forming apparatus, a side sealer, and an end sealer.