Depends. If I have to be walking around, my pockets. If I am going to be driving, I bring a camera case that fits in my pocket but it's a bit big for every day use. If I am going to be away, I put everything I can fit into the box my Riva 510 came in.
I am trying to put together a "master kit". Basically, I want a small bag that fits a battery, 2 cartos, and my charger. I need that to fit in a "car kit" that has fluids, wall charger, USB pass
through, atty's, carts, etc. Then I need a "travel bag" that I can fit all my stuff in, without being crazy big. That's my plan.