What commercial improvement did Knight's machine introduce to early paper bags?

Answer

It created sturdy, flat-bottomed grocery bags capable of standing upright.

Prior to Knight's invention, paper bags generally resembled simple folded envelopes. Her crucial innovation was the design of a machine incorporating intricate mechanisms capable of handling the paper stock in a complex, multi-stage process. The result of this mechanism was the creation of the modern, sturdy, flat-bottomed grocery bag that is recognized today because it could stand upright when placed on a surface. This apparently simple structural change carried massive commercial implications for how goods were packaged and transported.

What commercial improvement did Knight's machine introduce to early paper bags?
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