I have
wide angle lens
at least 2 spare XLR cables
gaffer / electrical tape
cable ties
leatherman type tool with pliers
pencils and paper ( pencils write in the rain)
rain cover...
mic stand or clamp...
plan "b" mic (if wireless dies or there's inteference, have a cable and a mic to plug in)...
spare ear buds/headphones to use when you left your primary ones in with laptop...
something to white balance on...
I must get a rain cover but they are big bucks in the UK. A kata CRC-14 is like $140
yes, I know the camera is worth alot but I really have spent enough already. Anyhow, it gives me a good excuse not to shoot in the rain. ;-)