We found one dictionary that defines the word tent-sack:

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1. tent-sack: Wiktionary

Definitions from Wiktionary (tent-sack) ▸ noun:  Synonym of bivouac sack ▸ Words similar to tent-sack ▸ Usage examples for tent-sack ▸ Idioms related to tent-sack ▸ Wikipedia articles (New!) ▸ Popular adjectives describing tent-sack ▸ Words that often appear near tent-sack ▸ Rhymes of tent-sack ▸ Invented words related to tent-sack