Everyone carries something they shouldn't, except for the absolutely weight-crazy. What do you carry that you could leave at home for a better base weight?
My first is obvious: a DSLR camera (Nikon D7000). It rides on my straps and gets used every trip, no exceptions.
Second: Thermarest Z-Lite sit pad. I have completely fallen in love with this little pad. I always strap it on, and I am always thrilled that I brought it with me in all weather.

