Have a look at the Billingham range. They are smart, extremely well made and probably outlive most of your camera gear. My oldest Billinghams have seen more than 20 years heavy use. Another advantage is, that they are extremely water proven and do not need an additional raincover.
Billingham Camera Bags | Professional Photographic Products
Alternatively I use Lowepro bags, as they are quite robust as well, if you don't go for the cheapest models. I personally find Crumpler bags nicely made, but nor realy the kind of workhorse I need and most other cheap makes wouldn't survive long enough for my liking. I do not want to buy a replacement every other year, even it is was cheap. It runs against the rule to not produce avoidable waste.
Ben
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