that set-up will definitely cover a very wide range of shooting opportunities and can certainly produce some great results for you.
Usually the equipment list is best defined on what kind of images you want your gear to be able to handle.
The only universal items I can think of that I personally would not be without are:
- UV filter for the lens, as much for protection as for it's effect on UV light.
- Cleaning kit, including a rubber-bulb to blow air where there may be dust
- I can't live without a two tripods of some sort. A full-size for flexibility and a small one for cramped quarters..alternately a small bean-bag, but that's just me.
- Last but not least: for flash - a diffusor or reflector, to soften up that ofttimes harsh flash.
Other accessories to consider could be a remote shutter release - wireless.
In terms of bags, I prefer a sling-back where you can get your camera out without taking the bag off entirely - but that depends on the situation. If you hike in rougher terrain, a backpack is safer for the equipment and more comfortable.