At the races, I shoot with my 70-200 and have my 17-85 (or whatever wide lens I own at the time) in a pocket for quick access during Victory Lane shots. 2 facts: -I need the extra lens, so I've gotta carry it somehow -Often, a time arises (bad wreck) where I need to run closer. My dilemma: -Running with the lens in my cargo pocket makes the lens swing, and it seems like that would negatively affect the lens, so I don't do it. Other than that cargo pocket, I don't know of any better way to hold that lens that'll keep it from bouncing around when I run. The questions: A) How 'shock-proof' are lenses, and would you trust a lens flying back and forth in your pocket hitting your leg? B) Is there a bag to put on me somewhere to hold the lens more secure? (if someone tells me to get a fanny pack i'll kick a puppy) What would you guys do?