Just a few things to make it really complete:I carry a tool kit with me that weighs more than all the other gear in my gig bag.
Large and small phillips head screwdrivers for everything from pickup screws to neck bolts.
Adjustable wrench
Needle nose pliers
electrical tape
Small flat head screw driver
Metric and standard metric key sets
A four string bass nut
Ground converter plugs
more electrical tape
Steel wool
Sharpie
Few fender picks although i don't play with them.
I also carry a three foot extention cord, surge protector power strip, extra AC cord and of course extra guitar/speaker/pedal cords.
No wonder I get tired hauling all that around! Actually it all fits in an old canvas diaper bag.
A soldering iron/solder
Multimeter
Outlet tester
and last but not least, a drum key. Yes, a drum key. Mine's made me a hero several times.
)
I turned it off, back on, and there my sound was. (sigh)