Lost 11 lbs. on my last 10 day Quetico  trip 6/27/11 - 7/6/11. I needed to lose a bit around the waistline anyways.  Usually cover a lot of water on trips. Being an avid fisherman, I like to be on the water almost all day and many evenings. That burns calories.  I bring a hammock but I find I am on the water more often and not in the hammock.