Usage History of 'backpacks'

The following chart shows how frequently 'backpacks' appeared in printed materials over time. For example, the word 'backpacks' occurred 4 times in books in 1908 and 14,416 times in 2008. From 1908 to 2008, the word 'backpacks' was used a total of 172,553 times in books scanned by Google. See Reference: Google Ngram project.

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