Truth is, when I go digging around in my saddlebag, I am often surprised by all the stuff!
The Kryptonite NY STD lock is 4.3 pounds!
It's a Carradice SuperC saddlebag with the SQR mount: that about 3 pounds.
A biking multitool, a Leatherman, and then a bag of tools that includes a set of allen wrenches, a screw driver, an 8 mm wrench, tire patch kit, & probably other stuff.
spare tire and small bottle of lube.
County maps for probably 5 counties.
Windblock fleece vest, nylon vest, nylon over-pants.
medical kit with who knows what, some big thing from CVS
seat cover and helmet cover.
In the handlebar bag I have some reading glasses, a head lamp, a balaklava and a head band and probably a neoprene face mask, i.e. whatever I am not wearing. The face mask is nice for going down big hills when it is below freezing! There are some snacks in there too.
I figure it will help me develop some power, climbing hills with all that! Fortunately I have a bottom gear around 18 inches! I use it a lot!