I love this bag so much that I bought one in green for the spring and another in gray for the fall.  Just big enough to hold what you need and still not weigh you down.  The adjustable strap allows you to use it as a shoulder bag or wear it across your chest.  Built-in organization with room for credit and id cards.  Won't fit your laptop or an extra pair of shoes, but with both hands free you can carry them if you need to do so.  Going to get a couple more in other colors!