I know everyone wants to keep costs down, but I think as anyone who is a traveling photographer will attest, you're going to want multiple bags. The thing I realized is that I want the bag that will be the absolute minimum for what I am taking with me on any particular shoot. I know Ron said he never travels without his laptop, but he's never had a DSLR where he will want to take it everywhere to capture shots. Going on vacation to Hawaii? Are you really going to lug your 17" Macbook Pro up into the mountains, jungle, or lava flow? Probably not. Going to visit the Florida Everglades? Taking your MBP with you on that Airboat? Hope not. Going to Paris? Want to carry that extra 8-10lbs of computer + bag up all 500+ crazily winding steps of Notre Dame? I only had a P&S at the time and I was winded when I got to the top. My point is that once you realize you always want your trusty DSLR with you "just in case", you'll also realize that you don't want to always have your MBP with you. Vacation evening out on the town with friends? Bringing a holster w/ a DSLR has your friends saying "wow that's a nice camera". Having a full on laptop/DSLR backpack has them asking "what the hell are you carrying around in there?" There are times when I want only the 7D+17-55. I'm going to eventually get a holster only for the body and lens. There are times when I want the 7D + 1 small zoom, that's my Tamrac Velocity 7x. There are times when I'll want my laptop as well, that's the Fastpack 250. And when I eventually get the cash together to buy either the EF 70-200 f/4L IS USM or the f/2.8 II IS USM, I'll have to get a larger shoulder bag than the Velocity because the f/4 and f/2.8 are much too big to fit in the Velocity. This hobby, like most, isn't cheap. And there isn't a one-size fits all otherwise someone would have already created it and we'd have all bought it.