I totally agree w/OBG. I like the combat harness/butt pack but there has to be counter balance between the front and rear. I find it is comfortable for hunting (4 legged and 2 winged varmints) because of the weight of the ammo in front counterbalances the weight of the butt pack and canteens. Yes, I tend to carry a large amount of ammo which is needed for sufficient weight up front.

I have found that using a large messenger bag (Israeli Paratrooper, Swedish Army, etc) is much more comfortable to carry on a day hike. It accommodates the gear that I deem suitable for the circumstances.