I need a camera bag that I can carry all day long without getting uncomfortable and still get easy access to while walking. My buddy recommended a messenger bag, but I don't want my camera flopping around. Also, I'm shopping for a circular polarizer for my 18-200 (72mm) lens. I've used a quantaray cp on my kit lens, but seeing as this is a decent lens, I want a good filter. I've heard that B+W make quality filters, any other recommendations? What's the difference between the Circular Polarizer, Multi Coated Circular Polarizer, and Kaeseman Circular Polarizer Multi-Resistant Coating?