There's a rabbit hole I recently got caught in again too
You need more parameters: how much you hike if any, is it just for travel and does it have to fit under an airplane chair, etc.
The photobackpacks don't carry weight that well compared to dedicated hiking backpacks, so if you hike a lot it might make sense to just use a hiking backpack with a photo insert. I just ordered myself 2 Deuters Futura fit this purpose, a 36 Pro and a regular 24L. Have yet to receive them. I wanted a mesh back panel, I have others.
I do have several photo backpacks but they either don't carry weight that well or are too bulky for general use. A small Lowepro that works okish for short hikes with a couple of lenses and an older Kata that carries quite a lot but not that gracefully so it's good mostly for travel. I also have a Mindshift 180 Pro that's just too bulky for usual trips, to my dismay I used it only a couple of times and now sits for nothing.
I'm looking for something that has a waist belt that is somehow functional to carry weight and ideally with a back access, fit moderate trips in intensity and time (4-6h). Lowepro has a couple of candidates among others.