Thanks for posting. I looked at a previous edition of the Mariposa and elected to stay with my Osprey Exos 58 of 2015 vintage, even with its tiny hipbelt pockets. The compelling feature of the Exos is the Airspeed suspension which ventilated so well as to put to shame all other packs I’d tried. Using the Exos, the back of my shirt never wetted through while hiking the PCT in July, August, September and October of that year. While the “58” may be a bit heavier at 40 or so ounces, Airspeed carries the day.
I mused that you struggled to access your water bottle without removing the pack. I haven’t the flexibility to deal with anything worse than the Osprey’s easy bottle access.
The Mariposa seems like a winner on most other points. The Osprey Exos works for me.
I need to get out more with my Exos. Cheers.