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In page Margaret E. Knight:

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Such flat-bottomed bags were already in general use in Britain since at least the 1840s and improvements to hand-production techniques occurred during the 1850s.[citation needed] For example, a patent was awarded to James Baldwin of Birmingham in 1853 for semi-mechanized apparatus to use in the making of flat-bottomed paper bags.[5] However, thinking to more fully automate the process, in 1868 Knight invented a machine that cut, folded, and glued paper to form the flat-bottomed brown paper bag familiar to shoppers today. This machine enabled the mass manufacture of flat-bottomed bags, increasing the speed of production.[1][6]