An air-packing device has an improved shock absorbing capability to
protect a product in a container box. The air-packing device is comprised
of first and second thermoplastic films where predetermined portions are
bonded thereby creating a plurality of air containers, a plurality of
heat-seal lands each sealing the first and second thermoplastic films in
a small area of the air container thereby creating a plurality of series
connected air cells for each air container, a plurality of check valves
for corresponding air containers for allowing the compressed air to flow
in a forward direction. The plurality of heat-seal lands at predetermined
sides of the air-packing device create triangled areas of the air cells,
and the air-packing device is folded at the heat-seal lands, thereby
creating an inner space for packing a product therein.