Tetrahedral shape packaging container and a tetrahedral shape packaging container method

A tetrahedral shape packaging container, comprising a tetrahedral shape bag assembly made of a resin film or resin sheet, said bag assembly having a first side face seam or a first side face folded portion;

• a second side face seam or a second side face folded portion opposed to said first side face seam or said first side face folded portion;
• a fourth side face seam or a fourth side face folded portion at an upper side of said bag assembly;
• a fastener provided below said fourth side face seam or said fourth side face folded portion and spaced therefrom, and on an inner face, of said bag assembly;
• and a third side face seam of said bag assembly, provided in a substantially orthogonal direction to a direction that said fastener extends, at an opposite end of the bag assembly to an upper side on which said fastener is provided, said third side face seam being formed from an opened lower side face of said bag assembly opposed to said fastener and said fourth side face seam or said fourth side face folded portion, said opened lower side face being a location at which an article to be packaged in said packaging container is inserted into said packaging container, with said opened lower side face being sealed after inserting said article to be packaged, so as to form said third side face seam, said article to be packaged being inserted in a state where said upper side of the bag assembly is sealed, whereby, when said third side face seam has been formed and said fastener sealed, said bag assembly is maintained with a tetrahedral solid shape in a state where said article has been inserted, and wherein said bag assembly is adapted to be torn apart between said fourth side face seam or said fourth side face folded portion and said fastener so as to take said article out of said bag assembly.