🛠️ Invention or technique

Flat-bottomed paper bag

Bolsa de papel de fondo plano

Date
1871 · confidence high
Place
Springfield, Massachusetts, United States
Credited to
Margaret E. Knight
Field
Tools

What it is

A square-bottomed kraft-paper bag, mass-produced by a machine that cuts, folds and glues the paper; it replaced cone-shaped wrappers as a way to carry goods.

The first mass-produced paper bags date to 1852 (Francis Wolle); Margaret Knight patented in 1871 the machine that gave them a self-standing square bottom.

What it led to

  • Standardization of the shopping bag
  • The paper packaging and wrapping industry

Built on

  • Cone-shaped paper bag (Francis Wolle, 1852)

Links

Sources✓ verified 2026-09-28