The Camera bag I use is the Lowepro Nova 2 AW. It is a satchel style bag that is great for carrying a few small to medium sized lenses along with some filters and other odds and ends. The bag has a water proof cover you can pull out of its zip pocket to cover the outside of the bag. It has a spacious main pocket that is divided in 3 with a small zipper pocket on the top flap. There is also a pocket on the front of the bag to store filters, film, etc.
In the main pocket you could fit up to 6 small lenses or 3 medium sized lenses.
When traveling I can stuff the bag with the following
OM-1n with 28-85mm f/3.5-4.5 attached, Vivitar 70-210mm f/3.5, Zuiko 50mm f/1.4, Sigma 24mm f/2.8, 6″ cable release, zip lock bag, disposable shower cap (to use as AW covering for camera and lens), 62mm polarizing and UV filters, 52mm UV filter, 62mm rubber lens hood, body cap, 8 rolls of film. This pretty much stuffs the bag to capacity and I will carry extra film and any extra lenses in a backpack that I will then carry the lowepro satchel in until I am ready to shoot.
I purchased the Lowepro bag from Ritz Camera for $40.