overpack

over- +‎ pack

overpack (third-person singular simple present overpacks, present participle overpacking, simple past and past participle overpacked)

1. (intransitive) To pack too much.

   Antonym: underpack

   • 2008 June 15, Michelle Higgins, “Checking Baggage? Not at These Prices”, in New York Times‎:

     Infrequent travelers tend to overpack, stuffing suitcases full of a different outfit for every day of the week, plus a few extras — just in case.

overpack (plural overpacks)

1. A container intended to hold smaller containers.
   • 2011, Minnesota Department of Transportation, “Minnesota Commercial Truck and Passenger Regulations Fact Sheet”, in http://www.dot.state.mn.us/‎, archived from the original on 25 June 2013:

     Each container in an overpack must be a package authorized for that hazardous material in the HMR.

• overpacker