An air bag packaging arrangement, comprising: an air bag which comprises at least one inflatable air cell, wherein said air cell comprises a first cell layer and a second cell layer overlapped with each other to form an air chamber and a valve opening communicating with said air chamber; and an air valve, which is a double non-return valve, comprising: first and second sealing films (21,21A; 22, 22A) overlapped between said first and second cell layers (12, 13) of said air cell and extended from said valve opening of said air cell into said air chamber thereof; and a check sealing film overlapped between proximal portions of said first and second sealing films (21,21A; 22, 22A) to define an air inflating channel (24, 14A) between said first sealing film (21, 21A) and said check sealing film, and a backflow prevention channel (25, 15A) between said check sealing film and said second sealing film (22, 22A), wherein said air inflating channel (24, 14A) is arranged for inputting air into said air chamber to inflate said air cell until distal portions of said first and second sealing films (21,21 A; 22, 22A) are overlapped and sealed to close said air inflating channel (24, 14A) by means of air pressure within said air chamber, wherein in case of air leakage between said distal portions of said first and second sealing films (21,21 A; 22, 22A), said air within said air chamber is guided to flow to said backflow prevention channel (25, 15A) for creating a supplemental air pressure to further seal and close said air inflating channel (24, 14A), so as to make up a deficient sealing effect of said first and second sealing films (21,21A; 22, 22A) characterized in that said air valve further comprises a first sealing seam bonding said first cell layer with said first sealing film (21, 21A) at said valve opening of said air cell, and a second sealing seam bonding among said second cell layer, said check sealing film, and said second sealing film (22, 22A) together at said valve opening of said air cell, wherein said first and second sealing films (21, 21A; 22, 22A), and said check sealing film are polyethylene films, wherein said air inflating channel (24, 14A) has a width gradually reducing from said valve opening toward said air chamber. an air bag which comprises at least one inflatable air cell, wherein said air cell comprises a first cell layer and a second cell layer overlapped with each other to form an air chamber and a valve opening communicating with said air chamber; and an air valve, which is a double non-return valve, comprising: first and second sealing films (21,21A; 22, 22A) overlapped between said first and second cell layers (12, 13) of said air cell and extended from said valve opening of said air cell into said air chamber thereof; and a check sealing film overlapped between proximal portions of said first and second sealing films (21,21A; 22, 22A) to define an air inflating channel (24, 14A) between said first sealing film (21, 21A) and said check sealing film, and a backflow prevention channel (25, 15A) between said check sealing film and said second sealing film (22, 22A), wherein said air inflating channel (24, 14A) is arranged for inputting air into said air chamber to inflate said air cell until distal portions of said first and second sealing films (21,21 A; 22, 22A) are overlapped and sealed to close said air inflating channel (24, 14A) by means of air pressure within said air chamber, wherein in case of air leakage between said distal portions of said first and second sealing films (21,21 A; 22, 22A), said air within said air chamber is guided to flow to said backflow prevention channel (25, 15A) for creating a supplemental air pressure to further seal and close said air inflating channel (24, 14A), so as to make up a deficient sealing effect of said first and second sealing films (21,21A; 22, 22A) first and second sealing films (21,21A; 22, 22A) overlapped between said first and second cell layers (12, 13) of said air cell and extended from said valve opening of said air cell into said air chamber thereof; and a check sealing film overlapped between proximal portions of said first and second sealing films (21,21A; 22, 22A) to define an air inflating channel (24, 14A) between said first sealing film (21, 21A) and said check sealing film, and a backflow prevention channel (25, 15A) between said check sealing film and said second sealing film (22, 22A), wherein said air inflating channel (24, 14A) is arranged for inputting air into said air chamber to inflate said air cell until distal portions of said first and second sealing films (21,21 A; 22, 22A) are overlapped and sealed to close said air inflating channel (24, 14A) by means of air pressure within said air chamber, wherein in case of air leakage between said distal portions of said first and second sealing films (21,21 A; 22, 22A), said air within said air chamber is guided to flow to said backflow prevention channel (25, 15A) for creating a supplemental air pressure to further seal and close said air inflating channel (24, 14A), so as to make up a deficient sealing effect of said first and second sealing films (21,21A; 22, 22A)