My wife, 16-year-old son, and I all have Just One packs and find them to be comfortable although somewhat heavy. The rifle scabbard is great - if your arms are long enough you can easily draw directly from it. We haven't had to carry very heavy loads with them yet (you buy a pack and end up finding deer and elk near the roads!) but have hiked with them all day multiple times. They don't have a lot of organizational options, but still enough pockets to work with. The hydration bladder pocket will only fit 2 liters or less.