Mouthwash - Eh, personal preference. The meds I take leave a nasty after-taste in my mouth first thing which brushing doesnt seem to rid of. I'll bring a travel sized bottle, wont take up much space.
Bike Cover - Um...was just thinking if it chucks it down...maybe I wont bring it then!
Lube - Small, again since I will be covering lots of (possible wet) miles, a good idea? Am I just being paranoid then?
What would a useful bike sized toolkit comprise of?
Spare key - noted.
Thanks