In her time, she was called "the most famous woman inventor,” but today, chances are, you’ve never even heard of Margaret Eloise Knight. It’s unfortunate, because If you do any grocery shopping, you have her to thank for making it so much easier. Her invention created a product that is as unassuming as it is ubiquitous.

A self-taught engineer, Margaret Knight invented the machine to produce flat-bottomed paper bags, and then founded the Eastern Paper Bag Company in 1870, creating paper bags for groceries very similar to the ones used today.

During her lifetime, as a woman-inventor during the late 19th and early 20th Centuries, she overcame a surprising amount of adversity to achieve both her goals and the recognition she deserved—at a time when few women held intellectual property. Here is her story…

Early Years and Early Inventions

Margaret E. Knight was born in York, Maine on February 14, 1838 to Hannah Teal and James Knight. After her father died, “Mattie,” as her parents nickna...