I use one of the simpler straps for my 5DIII because it usually has a smaller lens on it. I’ve tried the black Rapid and Cotton Carrier for my birding setup, but neither one really felt comfortable. I have a simple strap on it, mostly as added security, but I usually carry it by the tripod foot on the lens or attached to the tripod. I like the @Sandy_Richards-Brown idea of attaching to both ends of the lens. Maybe she could post a picture?