In the last few days I bought to add to my collection of camera bags a Lowepro Exchange Messenger Bag http://www.lowepro.com/exchange which was on special offer cheap, although I admit I haven't used it yet it looks to me to be ideal for inconspicuous street shooting , and although it has no padding it's very light and soft and moulds to the body, is made of waterproof material and has two padded moveable internal dividers and I can get my 35mm or Mamiya TLR gear with four lenses in it even with the prism on the Mamiya, I'm going to give it a test drive next week because it doesn't weigh a quarter of my Billingham bag.