Sentence examples for a bag from inspiring English sources

"a bag" is a correct and usable part of a sentence in written English.
It is a noun phrase that functions as the object of a verb or a preposition. It can be used when referring to a specific bag or an unspecified bag in general. Example sentence: I need to pack a bag for my trip tomorrow. (specific bag) Put your books in a bag before you leave. (unspecified bag).