"A satchel is a bag with a strap, traditionally used for carrying books. The strap is often worn so that it diagonally crosses the body, with ...
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the bag hanging on the opposite hip, rather than hanging directly down from the shoulder. The back of a satchel extends to form a flap that folds over to cover the top and fastens in the front. Unlike a briefcase, a satchel is soft-sided." - (en.wikipedia.org 02.03.2020)