Easily manipulated. One day I was identified as a graduate student (when I wasn't, really). My effort is recognized as a person approached me and asked, "are you a graduate student?"
The first step to make yourself a Grad student is to get a bag with wheels. You may get a small luggages. The rationale behind: a graduate student is "supposed" to check out lots of books from the library, so a wheeled bag becomes very important for the ease of transportation.
But, for best results, get one that has bearings in the wheels with soft-plastic coating on outside. Otherwise, you will attract a lot of attentions in YRL (a UCLA library): the floor is made with tiles that have tiny ditches in between; if your wheeled bag has a hard plastic wheels, it makes noises.