I bought a gossamer weight biking jacket that has sleeves that zip off. I can easily zip off the sleeves when it warms up, to just wear the vest and the sleeves fit in a back pocket. If it gets too warm to wear the vest, it fits in an expandable seat bag with my phone/small tools and the sleeves go in the jersey pocket. Snacks and money/chapstick/kleenex go in a top tube bag.