Interesting thread. Almost exactly like twelve million threads over on Whiteblaze.net or Backpackinglight or Hammock forums. I am a long time backpacker and a developing (first long trip next month) tourer. My backpacking base weight is about 11 lbs - maybe 12.5 for winter camping in the mid-atlantic. - includes down quilt, shelter (yes, I DO use a Cuben tarp - as well as a large 10X11 or 8X10 silnylon, depending...), clothes, kitchen, personal hygiene. When I start a new backpacking section on Monday, I generally carry 6 days' food and 2 liters of water. I filter along the way. My loaded 'Monday weight' is about 21-23 lbs including backpack and 2L water. So it ain't magic.....
Anyway, in preparing for this trip coming up, I am at a little bit of a loss to try and figure out - from all the cycling pictures and discussions and all - how someone can actually fill up four 1100 ci panniers, add handlebar bags, frame bags, etc, etc, and still honestly say they need everything they packed. Is there something about cycle touring that I didn't get? I have set up my bike with rear racks and low riders, but honestly I don't think I'll need front panniers if I have a decent trunk bag and a decent handlebar bag sitting on my mini rack up front.I do plan to bring 5-6 days' food, may not need it, but it's only a few extra oz anyway - small price to pay if I get stuck in camp due to a monsoon or arctic blast rolling in. I use Harmony House food (cheap plug here), their stuff is invaluable on a long trip and I can design my own dinners with it. Also Ramen, Oatmeal, cocoa, instant coffee, etc. And I'm no hero. I know folks whose base weights are 8 lbs or so. The REAL gram weenies. Of course, some of 'em get cold at night, and some try to bum food, filter, etc from time to time......
To me, bike touring is just like backpacking or expedition kayaking (I've done that too) - your bike is just a backpack, and it is up to you to make it as weight acceptable as you need it to be while planning for contingencies and maintenance. I plan to pack as I do for any ul section hike, but with a few additions - like hand tools, tube, CO2 pump - stuff like that.
If folks are really interested, i recommend you do a search on UL backpacking and you will be educated quickly - but beware...... it ain't cheap. There are many cottage vendors, diy plans, etc to help you get to your goal. Or, if anyone wants to talk about gear lists, I'd be glad to tell you what I do to shave weight. From there, you can make your own decisions about gear. One thing for sure: whatever weight you carry, just make sure you are ready to carry it.
p.s. Lose the toothpaste, folks, and use baking soda. It is dry and light. In fact, why would you carry anything that is full of water - except water, that is....