An expanded paper bag, cushion, or pillow has a distinctive shape. Given the dimensions of a flat rectangular bag with dimensions , , bounds for the maximum volume of closed sack obtained by
inflating the bag are approximately given by
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, 
, bounds for the maximum volume of closed sack obtained by
inflating the bag are approximately given by
![V=a^3[b/(pia)-0.142(1-10^(-b/a))]](/images/equations/PaperBagSurface/NumberedEquation1.svg)
