I've used the REI Flash, ZPacks and GG Mariposa. The Mariposa is my favorite and carries loads really well, even when overloaded. It has more capacity than I need which is helpful when I was guiding groups. I sometimes had to take weight off an ill or injured hiker so my pack might have been 5-10 pounds heavier and never felt it. I could easily carry 35 lbs. The Flash was also comfortable. I never could get my ZPacks to be comfortable.?
Our bodies are all different shapes and sizes so there's no one pack that is right for everyone.?
Inga