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I took my Kindle the three times I have walked. It weighs nothing and it only needs charging occasionally. Also the screen does not emit 'blue' light which may or may not affect you.
I have taken both on different caminos. Raincoat is heavier but more comfortable. You also have to carry a rucksack cover. Poncho is lighter but not breathable so sweaty and smelly. Try them both before you go.
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