Liquid container system

An article comprising:

• (a) a liquid container including a wall, a container opening for filling and evacuating said container surrounded by a container neck, and an air vent extending partway through said wall;
• (b) said wall including an outer PET layer and an inner PET layer, said wall including a delaminatable portion and a non-delaminatable portion, and a release agent located between said layers over said delaminatable portion of said container wall such that said inner layer can separate from said outer layer when liquid is evacuated from said container and air flows in through said air vent;
• (c) said air vent extending through said outer layer and terminating at said inner layer, and said air vent being permanently open to atmosphere, such that air can flow through said air vent and in between said inner and outer PET layers as liquid is withdrawn from said container;
• (d) said container including spacer means for maintaining said air vent open and out of contact with an external surface;
• (e) said inner and outer PET layers being bonded directly together in said non-delaminatable portion of said wall and said non-delaminatable portion including said container neck;
• (f) said container including a closure connected to said container neck and sealing said container opening closed;
• (g) means for non-removably connecting said closure to said container;
• and
• (h) said closure including a liquid opening therethrough, a removable cap for closing said closure opening prior to connecting a coupling thereto, means for preventing said inner layer from sealing off said closure openings prior to complete liquid evacuation, and means for engaging and opening a valve in a quick-disconnect liquid coupling when connected to said closure.