Ditch the heavy, bulky jeans for a pair of wind pants. Never leave home without a pocket knife, duct tape, and cable ties. A pair of light water shoes can be handy off bike(or on, with platform pedals.)
A couple of pre-tour overnighters will help sort it all out. If in doubt, don't take it, unless the psychological comfort of having it outweighs the extra drag.
Last edited by Cyclebum; 07-13-14 at 12:45 PM.