Definition of messenger bag
: a rectangular bag that is large enough to carry papers, books, etc., and that usually has a wide shoulder strap and a flap that typically covers the opening and much or all of the front of the bag Instead, the Oaklander bought a messenger bag … . After being popularized and perfected during the golden era of bike messengers, the one-strap, one-flap, over-the-shoulder bag has become ubiquitous. — Maghan McDowell
First Known Use of messenger bag
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