On backpacking trips longer than about three days, especially on solo trips, I like to bring a book along. I hardly ever get bored just relaxing and soaking in the views, but still it’s nice to have some extra brain food.
Because of the demands of backpacking, any good backcountry book needs to meet certain physical criteria. It must be compact and lightweight - so it must be a paperback, ideally with small condensed print. I had a brilliant idea once of publishing little “backpacker” editions of books, on thin Bible paper with really small print and perhaps a little companion dry bag. But for now, regular thin paperbacks will do.
Subject matter is also important to consider. Novels can be a poor choice because of the danger of ripping through the story too fast. You don’t want to haul around a book for five days if you’ll only get to enjoy it for one or two. Some novels can also seem like a petty distraction compared to the magnificence of nature around you. If I wanted petty distractions, I’d stay at home and browse YouTube.
I also try to avoid bringing books that have a singular disturbing topic; Under the Banner of Heaven by Jon Krakauer is good example of this. Interesting book for sure, but the last thing I want to do for five days in the mountains is immerse myself in the world of fundamentalist Mormonism.
In my opinion, the best backpacking books are non-fiction, in particular philosophy or spirituality related books. The subject matter can be every bit as profound as your surroundings, perhaps even leading to a deeper connection with the surrounding landscapes. Philosophical books demand closer concentration and slower, more deliberate reading than novels. One chapter can often provide enough food-for-thought to digest all day long, and being out in the wilderness provides the time and focus to do so. These books can also withstand multiple reads; sometimes you can even get more out of it the second time through.
This is an 
