Definitions for overnight bag
Random House Webster's College Dictionary
a travel bag large enough to hold personal articles and clothing for an overnight trip.
Origin of overnight bag:
overnighter, overnight bag, overnight case(noun)
a small traveling bag to carry clothing and accessories for staying overnight
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"overnight bag." Definitions.net. STANDS4 LLC, 2013. Web. 20 May 2013. <http://www.definitions.net/definition/overnight bag>.