horizontal v. vertical
I carried a double pouch, horizontally on the holster (strong) side for a number of years on a duty belt, as the horizontal arrangement did not gouge my gut or crotch when stooping, kneeling, traversing obstacles, etc. Several guys of my acquaintance did, irregardless of girth. It just limited the vertical depth of clutter on the duty belt.
I switched after loosing a mag from a horizontal pouch one night in the dark. Hung the snap on something in or around the vehicle while loading a deer decoy in the cargo area. The pouch apparently popped open, and in the gyrations of stuffing the deke, 'chute panel and whatever else we were fooling with, the mag came out onto the ground. We were standing around later and one of the guys noticed I'd lost a mag. Went back and there it laid where we loaded the SUV.
Thought to myself, .....I'm sure glad I didn't need that. Moved my cuffs to a more central position, but ahead of the holster, and moved the mag pouch to my left (off side) and vertical. I can jsut reach the mags with either hand. Took a bit of retraining, and for a while I was trying to "load my cuff's", but got past that soon enough.