clandestine
AR-15 Savant
I'm probably going to get one of these for my hiking rig....
I have a HPG rig like that and It's great.
It does hold some chest heat in but it's quite comfortable with or without a hiking pack.
I don't use a holster inside it, just one of those kydex trigger guard covers for my g17 & g19. The trigger guard holster has a lanyard that is tied to the pouch so when you draw the gun the trigger guard breaks away.