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E-reader is better than books for /out/. Weighs the same as your average book, but can have hundreds of different books on it, including field guides etc.
Secondly, has a built in backlight so you don't need to waste your headlamp battery to read. Usually have very long battery life.
Also, pic related would be much better than a bow. Doesn't weigh much but still great for fun or hunting small game.