I use a saddle bag with spare tubes X2 and showerproof top inside = lock
Pump attached to bike (dont get amicro pumops weigh nothing and if you have to pump up your tyre you need to be able to inflate it to the correct pressure within an hour (you have been warned)
Bumb bag type thing (has a proper name I am sure)multi tool , zip ties, keys, glasses and spare lenses , money, food , waterproof shorts,credit card, phone, batteries for lights in winter.
If you break down on road bike you can be a long way from home so be prepared.