I take my iPhone and ear buds along for short trips. I have downloaded a lot of music and have a Kindle app with a number of books aboard. For longer trips I bring an aging iPod Mini with my music, my iPhone for reading and whatever communication is available and a small battery charger. But, truth be told, I'm usually tired enough after a day's walking that if I lay down in my tent, I go to sleep.
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May I walk in beauty.