I just throw (gently, of course) my stuff in a camelbak day pack. I wrap the folded camera in the darkcloth (sweatshirt) and put it in the main pocket. the two lenses go in a smaller pocket at the top. The film holders go in the pocket with no zipper. The tripod fits in one of the side waterbottle holders and goes under the straps that tighten everything down, and the meter and lupe goes on the other side.

I've made an effort to buy the lightest camera and lens and tripod that I can find so the whole setup (with the full 3 liters of water) can't weigh much more than 20 pounds.