In the course of seven years, two of us backpacked the entire John Muir Trail in California in both directions, covering a total of 2x340km, and not once did we see any litter (such as tissues, toilet paper, cans, etc.). Recently, we hiked up the 3km BCMC trail and collected this in 90 minutes. The next day, we hiked it again and saw brand new trash: a coffee cup and tissues. Just saying.