It depends on how you plan to tour, what you currently carry, and how light you want to go.

Basically carry only what you need. You really need surprisingly little. Weigh and think about each item. Buy consumables in small quantities and only as you need them.

My ultralight article has some tips that may be applicable even if you merely want to reduce the load a bit.

I have gone pretty light (base gear total not including food and water 10 pounds) and have not found it to not be uncomfortable at all. I actually find the lack of stuff and the simple style to be a plus and the lighter bike to be a joy to ride.