The Bullpack is the best choice for real men in my opinion. If a fellow has a bit of a weak back , or perhaps isn't very strong, it might be an idea to look at internal frame packs from MEC. Or maybe just paint a wheelbarrow camo and use that.
As for running, I think it's often used in an attempt to elevate one's outdoor activities to the level of a true professional like a guide outfitter. It's right up there with terms like professional, military grade, commercial.
When in doubt, just pin it.