I hike a lot so I have some experiences to share here. I did about 36 miles on the AT a few years back. It took three days and, yes, I had to bring night diapers and pack them out (disposing of them when I passed a trash can near a parking lot entrance trail). My urge IC is bad, but on that hike I just immediately stopped, peed and continued hiking. Small leaks are unavoidable, but not the end of the world. At night though, I would have soaked my sleeping bag without diapers. I've been diapered many times on day hikes because there are usually a lot more people on those trails and it's much harder to immediately stop and pee. I plan on through hiking the AT one day, which will be a whole different story.