I'm a light weight camping guy myself, too, and have a bikepacking type set up on my cross bike that I've used for overnight type trips. Tent, bag, and pad weigh under 5 lbs and fit in a bag between my drop bars. Frame bag contains bits and pieces, and large seat bag contains clothes and cooking stuff if I bother. This means I'm not really packing much food, other than clif bars and water and maybe one backpacking type meal (or Indian "add water" type thing). I buy fruits and such along the way to the destination and eat whenever.
Clearly this his wouldn't work for remote areas where food isn't restock able at least once a day. But for my last trip my bike weighed 38 lbs. as I hit the road and that was probably about 22 lbs. of bike and 16 lbs. of bags and their contents.
My carbon road bike is a good five pounds lighter than my steel cross bike and yet I'm sure I could tour on it in just the same way with the same bags.
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Thirst is stronger than the rules. - Stars and Watercarriers, 1974