For the past year, I've been using an off-brand knockoff of a lowepro fastpack. The bag served me very well on our vacation to the Rockies last summer, but since then, I've purchased a 70-200, and upgraded from a Rebel to a 7D. I've outgrown my bag.
I'm thinking about buying two new bags, a small messenger style, for general walkabout, and a big pack to carry most of my gear. But there are so many options, and it can be difficult to tell online how big a bag is. Sure would be nice if one of the vendors had a buyers guide that allowed you to select bag style, and camera/lens combinations, and provided recommendations of specific bags.
I'm making my way through the "show me your bags" thread and taking some notes, but there's a ton of information in there, too. I thought I'd solicit advice as well.
For the walkabout bag, I'm looking for a something that will carry my 7D fitted with a normal zoom (currently the 18-55, though I may upgrade to a 17-55 or similar in the future), the 70-200, and perhaps an third lens (currently that would be the nifty-fifty, but in the future, it might be a 10-22). I know that with the 70-200, I'm limited in how small I can go, but I'd like a messenger/shoulder bag that's relatively small and inconspicuous, that I can get into without too much trouble with multiple clasps
For the backpack, I'd like something big enough to basically hold everything.
7D, normal zoom, 70-200, 50mm 1.8, 10-22mm (future purchase), speedlight, radio trigger, spare AAs, battery charger, lens cleaning kit, etc, etc, etc. This one isn't going to be as hard to identify, I think. I doubt I'm going to be as picky about the backpack, since I'm already aware it's going to wind up being huge. But the messenger bag, I'd like to be no bigger than necessary.
Any advice would be appreciated.