the inventive airbag 126 will remain sufficiently inflated for at least 5 seconds and preferably more as high as at least 20 seconds most preferably 0062 fig5 shows the side curtain airbag 126 prior to storage in its uninflated state within the roofline cylindrically shaped container 122 the thickness of the airbag 126 measured as the packing diameter as in fig7 below as compared with the depth of the airbag measured from the roofline cylindrically shaped container 122 to the bottom most point 128 of the airbag 126 either in its uninflated or inflated state at most 0 05 larger factors are possible with higher add on coating weights and larger yarns smaller yarns may be utilized with lower or larger add on coating weights as well which meet this limitation as well 0063 fig6 and 7 aid in understanding this concept through the viewing of the rolled airbag 126 as stored within the container 122 along line 2 the diameter measurement of the airbag 126 of example 3 above is roughly 20 millimeters the standard depth of side curtain airbags is roughly 17 inches or about 431 8 millimeters thus the preferred packing volume factor is about 0 046 20 mm 431 8 mm a comparative silicone based thick coating add on weight of about 4 0 ounces per square yard provided a diameter of about 25 millimeters for a factor of about 0 0579 25 mm 431 8 mm there are of course many alternative embodiments and modifications of the present invention which are intended to be included within the spirit and scope of the following claims in particular it is to be understood that any side curtain airbag of any production method and structure which exhibits low permeability measurements.