I have this Niggeloh sling
Niggeloh Neoprene Rucksack SlingA great new idea from Niggeloh. A rifle sling that securely straps your rifle to your back and can be quickly unhitched and swung round ready to take a shot.Can also be used as a conventional rifle sling. Superb for deer stalking on steep or uneven ground where...
wildstags.co.uk
If you try to use it like it's pictured there, it doesn't work very well.
However, I bought it with a better idea in mind. Rather than wear one strap over each shoulder like a normal rucksack, I sling the rifle, muzzle-down, on my right shoulder as I would normally with a single sling. Then bring the second strap over your left shoulder so it goes across the front of your chest. You've then effectively got one cross-body sling and one normal sling, attached together. It's easy to do, because the straps have a side-release buckle in the middle, so you don't have to wriggle in and out, and you can release the cross-body one without taking the rifle off your shoulder. Holds the rifle securely, muzzle points neatly at the ground slightly to my right and doesn't have any extra gubbins in the way of the pistol grip or annoying straps wrapped around your body to faff with. The rifle still carries nicely with both straps on the same shoulder if you're anticipating needing quicker access.
