In general I'm a bit of a technophobe and hate things that are likely to run out of battery and then become deadweight in my pack when travelling. My wife makes me carry a mobile phone and I do use a basic GPS since I got lost because of a faulty map (bad workman blames his tools).
However, I happily carry the Kindle I was given for my 70th birthday. I have a huge library on it, including all Thoreau's works. The Kindle saves me from running out of reading material and has plenty of bushcrafty reference stuff too.
Herbert Read, the great art educationist, who had been a soldier in WW1, compiled a one-volume book for WW2 servicemen with a vast range of content and called it,appropriately, "The Knapsack". I carried this for some time but eventually found it stale and Read was trying to achieve the impossible in finding content that all would want. My Kindle has all I want and can be edited and changed. And nobody wants to borrow any of the books on it!
I'm a convert. I wonder what Thoreau would have made of it, ("Beware any undertaking requiring new Technology" perhaps?)