If your back pack is deep enough, you can always put one camera on it's side with a small block of foam or a dedicated insert divider under the lens. It will normally take up the space of two lens, but it works. I do this with my Lowepro Trekker 300, however, if you do not have a long lens, most packs you can put two cameras in where a long lens would go, with a divider between them.
I have a Domke F7 that is designed for two cameras and several lens. You can use it as a regular shoulder bag, but there are also back pack straps that allow you to use it as a pack as well. I think Tamrac has several shoulder bags that also convert to back pack arrangements with accessory straps.
On vacation or when I am just out walking about, I like these kinds of bags because they are easy to work out of, and if you get tired of lugging them on one arm, it takes just a few seconds to snap on a strap and convert them to packs. They are relatively comfortable, not something to hike mountains with, but for me, are the best of both worlds.
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