I hike every couple of months with my son and his friends 15-25 km a day ,it is hot around here so by spring Ill be carrying 5 liters of water.Add that to a basic pack +20 meters of 0.5 rope and things get pretty heavy .This year I made them(16 year olds) pull their own weight so my pack lighter - rope-1ST aid etc. I also hike every week as part of A guide course, I carry far more than most and if anyone needs anything from binoculars to ass wipes they come to me .