Abstract: The pack according to the invention possesses an edge 4 delimiting an orifice and an evacuation means comprising an elastically compressible volume 5 having a wall, which possesses means for the passage of air 8, and arranged inside the pack near the edge 4 of the pack, but at a distance from this. The invention also relates to a device allowing the alternate compression and expansion of the compressible volume, whilst at the same time ensuring alternate communication between the latter and the inside of the bag or the outside.

Abstract: Within a bag for vacuum packaging of articles there is created, by means of a separately attached sheet, an auxiliary chamber which is evacuated when the bag is manufactured. This chamber may be placed in communication with the interior of the bag, after the latter has been filled and sealed. Such communication is achieved by piercing or tearing the separately attached sheet, so that the residual air in the sealed bag expands into a greater volume in which it is isolated from the product in the bag.