A pouch assembly comprising: - a pouch defining a cavity; - a spout providing access to the cavity defined by the pouch, the spout comprising: - an attachment flange sealingly engaged to the pouch, providing access to the cavity defined thereby; - an outlet tube having a first end cooperating with the cavity, and a second end spaced apart therefrom, and an outer surface, with a plug locking surface defined in the outer surface; and - a plug that is attachable to the spout of the pouch, the plug comprising: - a top wall, the top wall including an outer surface and an outer rim; - an inner axial skirt depending from the top wall in a direction opposite the top wall, the inner axial skirt including an inner surface, an outer surface, an upper end and a lower end, the inner surface defining an inner cavity, wherein the inner axial skirt is releasably extendable into the outlet tube of the spout; - an outer axial skirt spaced apart from and coaxial with the inner axial skirt, the outer axial skirt including an inner surface and an outer surface, an upper end proximate the top wall and a lower end spaced apart therefrom; the outer axial skirt further comprises a seal bead positioned on the inner surface of the outer axial skirt spaced apart from the upper end, the seal bead extending inwardly toward the inner axial skirt, characterized by - a thread extending about the outer surface of the outlet tube, - a portion of the inner axial skirt being spaced apart from the outlet tube, thereby precluding sealed engagement of the inner axial skirt with the spout of the pouch; and -the seal bead being structurally configured to hermetically seal against the spout with the seal bead forming a hermetic seal against the plug locking surface of the outlet tube. - a pouch defining a cavity; - a spout providing access to the cavity defined by the pouch, the spout comprising: - an attachment flange sealingly engaged to the pouch, providing access to the cavity defined thereby; - an outlet tube having a first end cooperating with the cavity, and a second end spaced apart therefrom, and an outer surface, with a plug locking surface defined in the outer surface; and - an attachment flange sealingly engaged to the pouch, providing access to the cavity defined thereby; - an outlet tube having a first end cooperating with the cavity, and a second end spaced apart therefrom, and an outer surface, with a plug locking surface defined in the outer surface; and - a plug that is attachable to the spout of the pouch, the plug comprising: - a top wall, the top wall including an outer surface and an outer rim; - an inner axial skirt depending from the top wall in a direction opposite the top wall, the inner axial skirt including an inner surface, an outer surface, an upper end and a lower end, the inner surface defining an inner cavity, wherein the inner axial skirt is releasably extendable into the outlet tube of the spout; - an outer axial skirt spaced apart from and coaxial with the inner axial skirt, the outer axial skirt including an inner surface and an outer surface, an upper end proximate the top wall and a lower end spaced apart therefrom; the outer axial skirt further comprises a seal bead positioned on the inner surface of the outer axial skirt spaced apart from the upper end, the seal bead extending inwardly toward the inner axial skirt, characterized by - a thread extending about the outer surface of the outlet tube, - a portion of the inner axial skirt being spaced apart from the outlet tube, thereby precluding sealed engagement of the inner axial skirt with the spout of the pouch; and -the seal bead being structurally configured to hermetically seal against the spout with the seal bead forming a hermetic seal against the plug locking surface of the outlet tube. - a top wall, the top wall including an outer surface and an outer rim; - an inner axial skirt depending from the top wall in a direction opposite the top wall, the inner axial skirt including an inner surface, an outer surface, an upper end and a lower end, the inner surface defining an inner cavity, wherein the inner axial skirt is releasably extendable into the outlet tube of the spout; - an outer axial skirt spaced apart from and coaxial with the inner axial skirt, the outer axial skirt including an inner surface and an outer surface, an upper end proximate the top wall and a lower end spaced apart therefrom; the outer axial skirt further comprises a seal bead positioned on the inner surface of the outer axial skirt spaced apart from the upper end, the seal bead extending inwardly toward the inner axial skirt, characterized by - a thread extending about the outer surface of the outlet tube, - a portion of the inner axial skirt being spaced apart from the outlet tube, thereby precluding sealed engagement of the inner axial skirt with the spout of the pouch; and -the seal bead being structurally configured to hermetically seal against the spout with the seal bead forming a hermetic seal against the plug locking surface of the outlet tube.