I like sling camera bags. The kind which you wear diagonally, and slip under the right arm for quick access to the contents.
Since getting the Nikon CX 70-300mm lens (my review), I have been looking for a sling bag for it. I was looking for a bag into which I could slip the lens, mounted to a camera, and with the hood mounted, ready for use. However, not many bags are large enough.
One bag which does fit, though, is the Tamrac Velocity 7x. The bag comes with two internal dividers, which can be placed wherever you want with velcro:
Normally, I only use one of these dividers, to make one big and one slightly smaller room:
That way, I can carry one camera with the lens mounted, and use the other side for other purposes. As the Nikon CX 70-300mm lens (my review) is good for bird photography, it is natural to bring a pair of binoculars, for example:
It is also possible to use the front pocket to store some extra lenses. It is large enough to contain any other Nikon 1 lens, except for the 70-300mm lens. The front pocket can be used to carry memory cards and batteries, and has a clever system to recall which one is full, and which one is used.
The bag is to be carried diagonally across the torso. When in the rear position, it is reasonably level, so you don't need to worry about stuff falling out, even if you don't close the top. The wide band helps keep the bag in place, so that it does not slip around while walking or even cycling:
The bag slides under the right hand to the front position, where you can access the contents. It is also quite level here:
I have used this bag now for half a year, and I think it is very useful for use with the Nikon 1 V3 and Nikon CX 70-300mm lens with the hood mounted in the ready position. Just slip the bag under the right arm, grab the camera, extend the lens, and you are ready to shoot!