Although not really what the OP asked I carry a small 4 oz total WP journal and WP space pen with me when I thru-hike. As I learn knew sayings, philosophies, poems, writings, encouraging thoughts, bits of wise advice, new ways of thinking, etc that speak to me as I hike I copy them dowm in the journal and keep referring to them through my trek. This way, even after many years have passed since my hike, I can refer back to these journals to recall where I was and what I was thinking at the time and compare it to my present day beliefs. Like I was rightly taught several years ago thru-hiking doesn't just have to be about hiking! It's about the entire journey or life's experiences you have while hiking!