Abstract: This leaktight container includes four superimposed sheets (1, 2, 3, 4). The sheet (1) includes a precut tab (5) welded (13) to a portion of the sheet (2). A passage (10) is formed between these sheets (2) and (3) and acts as a valve between the inside and the outside of the leaktight container formed between the sheets (1, 4). A cut (9a) in the sheets (2, 3) allows the passage (10) to be placed in communication with the inside of the container formed between the sheets (1, 4). By pulling the tab (5) the wall of the passage (10) formed by the sheet (2) is torn and this passage is placed in communication with the outside.

Abstract: A bag for packaging liquid formed using plastic in film form is disclosed. The bag includes a leaktight chamber for liquid and a pocket, adjacent to the chamber, in which a pipe for withdrawing the liquid is housed. Access is provided to the inside of said pocket. An opening is formed through part of the wall of the pocket, adjacent to the chamber, to allow the withdrawing pipe to enter the chamber in a leaktight fashion. The opening is situated at the end of a tubular element of decreasing section, at the place where the section is the smallest with the element being formed from a film of plastic forming one wall of the pocket adjacent to the chamber. The tubular element accommodates the pipe for withdrawing the liquid from the chamber and is at least equal to that of the opening, so that the tubular element forms a seal around the withdrawing pipe.

Abstract: Inflatable packaging including a valve formed by a channel made between two flexible sheets extending at least partly inside the inflatable packaging and having a first opening communicating to outside of the packaging and a second opening communicating to inside of the packaging, the two flexible sheets being designed to be pressed against each other as soon as a force keeping the flexible sheets apart is removed, thus preventing an inflating gas from escaping from the packaging, wherein the two flexible sheets extend between two edges of the packaging and the first opening coincides with a second opening passing through one wall of the packaging, the edges of the first opening and the second opening being welded to each other and, upstream of the first opening, the two flexible sheets are welded to a body of a tab cut into the one wall of the packaging, wherein the tab includes one tab end by which the tab may be grasped which is free with respect to the two flexible sheets, and the tab is isolated from an