I've banged on about this several times before but I'm going to do so again.
A kindle is a marvellous thing if you are away for multiple days, particularly in areas where access to electricity or wifi might be limited.
Aside from the fact that it can contain thousands of books, the battery lasts a month and it weighs less than a single paperback.
In addition you can put pdfs and word documents on it. When I go camping in the Lakes I can take every Lakes bus timetable, I also put on a table of sunrise/sunset times, you can screen grab or save a pdf of maps, route descriptions, booking confirmations etc. etc.
All the information you need and all your night time reading material with almost no weight, no cables etc. all accessible absolutely anywhere.
In addition, 1000s of books out of copyright (all the classics for example) can be got for free at gutenberg.org.
When you have internet access it has a web browser, admittedly it's not the most satisfying browsing experience but it works if you want to check the weather forecast etc.
Don't leave home without it.
Before anyone jumps in, as they invariable do, yes, I still prefer and mainly read proper paper books but they're not great for lugging round in a backpack.