Canvas slings are very easy to make..I make them for my rifles and my binocs..The are very good for binocs if you carry your binocs under your left arm, slung across the right shoulder..You can then move them to any position like on your chest or on your back and the canvas will not let them slide out of that required position...It darn neat, an old PH African carry trick, much better than any of the gadgets for sale in this country..