Margaret Eloise Knight (1838-1914) was a prolific late 19th- and early 20th-century inventor. She made improvements to various devices but is best known as the creator of the flat-bottom bag used in the retail industry.| New England Historical Society
Margaret Knight, a mechanical genius, patented the machine for making flat-bottom paper bags in 1871. She made her first invention as a 12-year-old mill girl.| New England Historical Society