of 25 u03bc and polyethylene of 40 u03bc from the viewpoint of airtightness and manufacturing cost the supplementary graduations 13 provided on the inner surface of the container may be printed on the inside member 2 however the graduations 13 are preferably printed on the outside member 1 since these graduations 13 must be precisely positioned with respect to the window 11 of the outside member 1 the container filled with a large quantity of the content may be laterally expanded under a weight of the content and make exact measurement difficult to overcome this problem there is provided a shape retainer 14 as illustrated by fig9 the shape retainer 14 is a substantially square thin plate centrally formed with an opening 15 the opening 15 is also of a substantially square shape the opening 15 is dimensioned to come at least partially in close contact with the outer surface of the side wall 8 of the self supporting container the opening 15 is provided at its four corners with circular arc shaped cutouts 16 respectively to facilitate the container to be inserted into the opening 15 the opening 15 has a pair of opposite sides formed with substantially triangular cutouts 17 respectively to receive the side margins to paste one or more such shape retainer s may be put on the container from.