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dag bag
The dag bag was a type of school bag popular in primary school. It was simply a type of cotton bag that you could sling over your shoulder. It often had things like "homework causes brain damage" written on it: Stuff your throwdowns in your dag bag.
Contributor's comments: It may not be a transplanted Americanism, but the same phrase is colloquial in the New York City area for a shopping bag imprinted with the D'Agostino's supermarket chain logo, and was used in the company's advertising as long as 25 years ago.
Contributor's comments: In North Sydney in the early 80s the "dag bag" was the official school bag with school logo that wasn't compulsory at a government school so only the "dags" had one.