[The ONLY reasons for those holsters, is to put the sidearm below the level of body armor.
Otherwise, they suck.
Bingo!
I have tried them and don't like them one bit. Not exactly quickly accessible and has a tendency to allow mags to be dumped out of automatics.
For hunting and backpacking, I went with an on the chest rig, the Chesty Puller.
http://www.simplyrugged.com/chesty-puller-conversion-system/Doesn't interfere with pack shoulder straps or belt, and it is right there in case you need it.
