Someone above asked about carrying a rifle in the SO Peregrine. You certainly can put the rifle in the side bags, and it's very secure there. Great if you're covering ground, but not if you need quick access.
I've found there is a more accessible option. The frame is U-shaped, and the vertical bars stick out a bit at the top (for load lifters). You can loop a rifle sling around one of those bars, and it makes for a good hold. Easy. Obviously not quite as secure as strapping it into a pocket, but I've covered many miles this way and it's been solid.
I've found there is a more accessible option. The frame is U-shaped, and the vertical bars stick out a bit at the top (for load lifters). You can loop a rifle sling around one of those bars, and it makes for a good hold. Easy. Obviously not quite as secure as strapping it into a pocket, but I've covered many miles this way and it's been solid.