Margaret Eloise Knight was an American inventor who helped revolutionize the paper bag industry. In 1867, there was the Columbia Paper Bag Company, a factory that made 2 types of bags: flat bottom and non-flat-bottom. Flat-bottomed bags were more useful, as they had greater capacity and could be kept upright, but they had to be manufactured, making them more expensive and limiting their use. Margaret worked for the company and, for a year, helped perfect a machine that folded and glued paper to form flat-bottomed bags.