Inflatable foil sachet, especially for packaging purposes

An inflatable film bag for packaging purposes comprising:

• first and second elongate film portions, one overlying the other, defining a longitudinal direction and a transverse direction, at least one longitudinal edge of said first and second film portions being interconnected with one another by a first longitudinal seam, said first and second elongate film portions having a plurality of transverse seams which, with said first longitudinal seam, define a plurality of substantially rectangular inflatable chambers formed between said first and second film portions and sequentially arranged along said inflatable film bag in the longitudinal direction,
• a fluid supply channel extending in the longitudinal direction, along the entire length of said inflatable film bag and located adjacent said first longitudinal seam, for inflating said plurality of chambers of said film bag with a medium, each of said plurality of chambers having at least one fill opening communicating with said supply channel to allow the medium to enter into each of said plurality of chambers, and each said filling opening automatically closing, after completion of the inflating process, due to an internal pressure within each respective chamber,
• wherein each of said plurality of chambers has a said filling opening interconnected with said supply channel via at least one channel branch, and each said at least one channel branch is located adjacent said first longitudinal seam and is configured so that each said at least one channel branch will sufficiently bend and crease, as said film bag is deformed during inflation, thereby creating a high flow resistance from the interior of each said chamber to the exterior environment.