A rifle sling comes in real handy if you spend a lot of time in the woods. One will free your hands for a light and staff in the pitch dark, and one can be a godsend when dragging out a deer. I bought one of these from October Country 20 or so years ago. I walk in with my rifle slung and remove the sling when I'm on stand or still hunting. I seldom have it on a rifle in daylight but it's always in my pouch.
http://www.octobercountry.com/universal-sling/
http://www.octobercountry.com/universal-sling/