Here are some things carry in the jacket when riding:
Copy of license/insurance – in case you forget your wallet.
Toll money – coins as needed.
Tire gauge – to check my tires any time.
Tissues, lip chap, sun screen and whatever
Map(s) – for when lost.
Visor defogger spray/fluid – for hot wet weather.
Glove liners – Light inner gloves for cold weather or passengers.
Spare $ – as you never know.
Other just in case things I carry on the bike are:
Basic tools: pliers, Philips/slot screwdrivers, plug socket, crescent and spanners.
First aid: Band-aids and antiseptic.
Balaclava – just in case.
Wind-breaker – for passengers and just in case.
Bungee cords – for unexpected luggage.
Large black plastic bags – to put luggage in when it rains.