I've been using the Op/Tech straps for years, probably since the early '90's.
When I thought my XE-7, and lens, 360PX flash was heavy ...
>>>>>> Fast Forward To 2012 >>>>> I bought an
RB67 With Prism, Power Drive Back, and 100 - 200mm lens { Almost 10 pounds }
And I finished off the package with 4 ounces of Op/Tech Strap. Unfortunately I
spent my allowance on lots of RB Accessories, so I had to use nylon tie wraps to
prevent the Quick Release Mechanism from becoming disconnected.

Enjoy The Weekend !