What should I carry in my bag/purse?

Well, I'm 12 and I recently got my "you know what" (if you know what I mean), so my mom said I'm gonna have to start carrying a bag or a purse. The thing is, what should I put in it (besides pads, obviously)? I don't wanna carry a bag just for THAT reason, what do you girls put in your bags and purses?