#SundayQuestions: Which book has been with you to the most places?

I know this question is targeting physical individual books. But since most of my books live inside my phone or tablet. They go with me everywhere. Whether it's to work, on walks or to the bathroom... my books are with me everywhere.

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Nonfiction Tag

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So, where do you and your book most frequent together?

Question  came from Justyourtypicalbookblog.blogspot.com. From a list of questions out of one of those questionnaires.