For 90% of my hikes and shoots, I take a smaller bag. Much easier on the shoulders and enthusiasm. This camera bag almost always carries the 1ds mk2 and Canon 24-70/2.8. Depending on the work, I'll pack a either small wide angle prime, like the Leica 19mm f/2.8 Elmarit-R, or the zoom Leica Vario-Elmar 21-35 mm f/3.5-4 ASPH. Telephoto work is handled by either the Canon 70-200 f/2.8 USM IS or the Leica 180mm f/2 APO-Summicron-R. I'll usually throw in either Canon's excellent Teleconverter 1.4X II or the Leica 2X APO converter for the 180 so I can get a bit more reach.
