An interesting list assembled from someones experience and a large discussion thread on some forum (yeah scientific!) anyway its an interesting list of books.
I am not sure which books backpackers carry with them these days so this list may be a little out of date. The concept of backpacker books goes back to the days of the hippy trail when travellers would carry such classics as the I Ching, the Tibetan Book of the Dead or anything by Herman Hesse. A backpacker classic should have an element of profundity, preferably mystical -if not it should have cult status or be a statement about who you really are. There is an element of self discovery in setting off – the path to enlightenment, the journey inwards…A backpacker book is not a ‘beach read’–the book must be worth the weight and space it takes up and should be reverentially handed on to other travellers or left in a hotel or bus station for another seeker to chance upon. I have garnered this list from my own experience of buying books from travellers, various lists on the web (one at Amazon) and an enormous thread about which books people would leave on a bus.