Usage History of 'backpack'

The following chart shows how frequently 'backpack' appeared in printed materials over time. For example, the word 'backpack' occurred 2 times in books in 1845 and 70,455 times in 2008. From 1845 to 2008, the word 'backpack' was used a total of 795,261 times in books scanned by Google. See Reference: Google Ngram project.

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