Right now I have a basket on the back of my bike, and a little pouch on the front.

In the basket -- always -- water. If I'm going to Starbucks, there will be a case with a couple of books and/or my laptop in the basket. Otherwise, proably just water. (My water holder came off and we haven't put it back on yet.)

In the pouch--cellphone, iPod, keys, Burt's Bees lip shimmer. (Papaya color.)

Obviously I don't go far and don't need much!