We found one dictionary that defines the word overpacker:

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1. overpacker: Wiktionary

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