Just for fun, I thought I'd post three photos of my loaded touring bicycle on tours of three different lengths.
-- The first was a week long tour through the Canadian Rockies in late August 2005 (there is another bicycle behind mine)
-- The second was a month long tour of Europe in August 2007 (just got back!)
-- The third was a three month tour of Australia in October - December 2004
For all three, I've ended up carrying approximately the same amount of gear, although, if anything, I think I had slightly more with me on the week long tour ... it was only going to be 1 week, so I thought I'd bring a luxury item or two.
Does the amount you carry vary with the length of the tour? The location of the tour? Or does it pretty much remain the same?