Lots of our med techs seem to be liking the military pockets just about knee height. With a buttoned pocket tab they seem secure.
I think that the snugness or looseness of the pants has a strong bearing on the length of pockets in pants.
The military fatigues my brother gave me when he retired were very good for hiking and back packing. Seemed like everything but sleeping bags could go in all the pockets!!
Might be worth it to look carefully at both these. I also had a pair of comfy pants that allowed my cell to fall out gently on the rug when I was sitting on the royal throne and I often left home without it. Had to get rid of them, I don't want to drive anywhere without my cell handy.