Definition of combination package
: a package of fourth-class mail to the outside of which is affixed a letter or other piece of first-class mail matter
—used in the U.S. postal system
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“Combination package.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/combination%20package. Accessed 17 Sep. 2021.
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