Gord's answer is a wonderful example of how we each hike our own hike. I don't take an e-book because I can read those anywhere--I want to spend the time on a backpacking trip doing the things I can't do at home. Those things include looking at the mountains, fishing, sitting quietly by a lake or stream....and taking photos so that I can explore painting the scene when I am back at home...
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Check our our website: http://www.backpackthesierra.com/

Or just read a good mystery novel set in the Sierra; https://www.amazon.com/Danger-Falling-Rocks-Paul-Wagner/dp/0984884963