If you've aquired a lot of photographic gadgets, this is the bag for you. Whilst it might not be the cheapest on the market its of good quality, tough, durable and waterproof. The best bit is the flexibilty with a number of useful external and zippable pockets useful for spare batteries, memory cards and the like whilst internally there is plenty of space that can be configured to your own requirements; currently I'm carrying one DSLR camera, 3 lenses including a telephoto, battery charger, leads and connections and various documents.
The bag might be considered to be a bit bulky to carry around all day fully loaded, but I'd rather suffer that than have damaged kit!