accordion like continuous uninterrupted side wall 100 c that interconnects the front and rear portion of the assembly so as to define the fluid reservoir 102 as illustrated in the drawings the accordion like side wall 100 c comprises a multiplicity of adjacent generally u201c v u201d shaped interconnected folds while rear portion 100 b includes a generally cup shaped recess 104 having a wall 104 a as best seen in fig3 hexagonal shaped protuberance 99 is closely received within the cup shaped recess 104 extending from wall 104 a is an ullage defining protuberance 106 the purpose of which will presently be described reservoir defining assembly 100 is constructed in accordance with aseptic blow fill seal manufacturing techniques the character of which is well understood by those skilled in the art basically this technique involves the continuous plastic extrusion through an extruder head of a length of parison in the form of a hollow tube between and through two co acting first or main mold halves the technique further includes the step of cutting off the parison below the extruder head and above the main mold halves to create an opening which allows a blowing and filling nozzle assembly to be moved downwardly into the opening in the parison for molding and then filling the molded container in a sterile fashion containers for use in dispensing beneficial agents in specific dosages such as the reservoir assembly of the present invention present unique requirements for example it is important that as much of the beneficial agents contained within the reservoir assembly be dispensed from a container to avoid improper dosage waste and undue expense accordingly the previously identified ullage defining protuberance 106 is provided which functions to fill the interior space of the collapsible container.