On most rides all I take is what I always have in my pockets, a helmet, gloves and sunglasses.
On long rides I would also wear or pack a jacket.
For macho male Harley Davidson riders there is a new product on the market called a blue pill carrier that attaches to the key ring. Its very similar to the small metal tubes that fit on key rings for nitroglycerin tablets people with chest pains carry. The "blue pill" is, of course, Viagra.