I usually take a F/2.8 12-24 DX with my DSLR. The straps handle that well and keep it from swinging. I have a couple other F/2.8 lenses that might be too much for it but I wouldn't take them backpacking either. I also use the harness for binoculars when hunting.
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Just because you don't take an interest in politics doesn't mean politics won't take an interest in you.... Pericles (430 B.C)