To your kit I'd add:
spare spark plug
roll of tape
about $3 - $4 in quarters for phone calls & vending machines
cheap, thin poncho from the dollar-store
(to sit out the rain in or cover your bike while you're in McDonald's)
small note pad and pencil
small (legal) pocket knife
matches or lighter
any required medicine
All of the above won't take up much room ... pretty much just a hand full ...
or will roll up in the bandana.