Margaret Eloise Knight (February 14, 1838 – October 12, 1914) was an American inventor, notably of the flat-bottomed paper bag.
She has been called "the most famous 19th-century woman inventor".
She was working in a paper-bag factory when she devised a new way to put together the bags.
She founded the Eastern Paper Bag Company in 1870, creating paper bags for groceries similar in form to the ones that would be used in later generations.