Because who wants to carry groceries in a paper cone?
Before flat-bottomed paper bags, shoppers carried purchases in wooden crates or rolled into paper cones. At best, they got wimpy envelopes that tapered into a V-shape, which everyone knows are barely durable enough for greeting cards.
The force behind those sturdy Whole Foods paper bags you can reuse a hundred times: Margaret E. Knight. In 1868, Knight invented a wooden machine that folded and glued paper into an economical, roomy, and rectangular receptacle.
Then a man stole her idea.
Now go and read about this marvelous woman, HERE