Disposable seal and lock beverage pouch

A fillable, sealable, disposable container for a liquid, comprising:

• 1) opposed front and a back walls formed of a fluid-impervious plastic film material of given thickness, each wall having an upper portion, opposed side edges, and a lower portion, said front and back walls being joined along the opposed side edges, wherein at least the front wall is formed of a single layer sheet of a low density polyethylene;
• 2) a bottom stabilizing surface, comprising a connecting lower wall, connecting the lower portions of the front and back walls;
• 3) a liquid receiving opening the upper portions of the front and back walls;
• 4) a sealable fluid-tight liquid retaining seal about said opening, for sealing the upper portion of the front and back walls, to retain liquid in the container;
• 5) printed indicia for a straw hole on the front wall of the container, located beneath the liquid retaining seal in the upper portion of the front wall, said printed indicia providing an imprinted indication on the film material of the location to be pierced by an external straw;
• and
• 6) printed indicia on the front wall, below said indicia for a straw hole, providing an imprinted indication of the maximum level of liquid to be added to the container;
• wherein said plastic film material is flat and uncut at the location of the printed indicia and is of such material and such given thickness as to be pierceable by a rigid plastic straw at the location of the printed indicia;
• and
• wherein said liquid receiving opening maintains an effective pouring diameter, while the container is supported on its bottom stabilizing surface.