I've posted this before, but maybe it will help and therefore bears repeating
My stuff is all 4x5, but such a kit must be able to be adapted to smaller cameras as well.
I use a combination of fanny pack, fly-fishing vest and over-the-shoulder pouch to carry my gear. The fanny pack is a standard sporting-goods store item as is the fly-fishing vest. By dividing up the weight-bearing points, I have a lot less shoulder fatigue.
I found a pack with a wide hip belt and additional shoulder strap that allows me to unbuckle the belt and sling the pack around forward so I can work out of it as a shoulder bag. The fanny pack holds my wooden field camera and four lenses plus 52mm and 67mm filters. The tripod can be strapped on underneath if needed (I usually just carry it in a hand unless I need to scramble on all fours). If you shoot handheld, you don't even have to carry a tripod.
The fishing vest contains Pentax Spotmeter, viewing frame, lens shades and a large number of other accessories in its various pockets. The meter is tethered to the vest so it cannot hit the ground if dropped. I find the accessibility of stuff in the vest pockets really handy. It's surprising how much weight one can get out of the main bag just by using the vest pockets for accessories, spare filters, etc.
I use a small over-the-shoulder pouch for film holders and another small lens, which I continually switch from side to side to avoid shoulder fatigue. You may not even need such a thing.
Everything lives in its respective place, so getting ready to go means putting on the vest (which I often just leave on), strapping on the fanny pack, slinging the pouch over my shoulder and grabbing the tripod.
When I set up to take a shot, the pouch comes off and hangs on the lock knob for the center column of the tripod for convenient access and a bit of extra stability. The fanny pack turns into a shoulder bag which never has to touch the ground (helpful in wet situations).
On my web site there is a photo of the set-up in action:
http://www.doremusscudder.com/?m=9&s=40
Hope this helps,
Doremus Scudder
www.DoremusScudder.com