We found one dictionary that defines the word underpacker:

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1. underpacker: Wiktionary

Definitions from Wiktionary (underpacker) ▸ noun:  A person who underpacks. ▸ Words similar to underpacker ▸ Usage examples for underpacker ▸ Idioms related to underpacker ▸ Wikipedia articles (New!) ▸ Popular adjectives describing underpacker ▸ Words that often appear near underpacker ▸ Rhymes of underpacker ▸ Invented words related to underpacker