I was thinking about upgrading to a 200 AW to accomodate my 70-200mm f/2.8. But then again, I don't really want to take that big lens everywhere. So now I'm thinking I might get the LowePro Lens Case 2 and use the "SlipLock" system to attach it to my 100 AW. But then, I don't know if I trust that lens to a velcro attachment system. It's possible the lens case hanging off the bag may the whole thing awkward to carry. Has anyone tried a LowePro lens case on a sling pack attached at the SlipLock loop?