For quite a while I have been looking for the right bag to carry my kit around and my most recent purchase is the Lowepro Passport Sling. I’ve only had it for a while and it has been good so far. Its good for photowalks and getting around as I usually don’t like carrying a ton of gear around.
I try to take a minimalistic approach when it comes to lugging my gear as I think additional weight just wears you down and you will not be able to shoot for as long as you would like to or start todevelop a reluctance to take your gear with you.
In my bag (Lowepro Passport Sling), I usually have:
SONY A77 camera with OPTECH USA strap (these are really comfortable)
Usually with a 35mm prime lens attached to it.
A couple of SD memory cards
A spare battery.
A business card holder with cards of my photoblog.
Optional items that I may carry at times.
SONY 16-50mm lens (great for video or if I need a zoom)
Flash and Phottix wireless trigger