I alternate between my purse, laptop bag, and a bigger bag that fits books for class, depending on where I'm going. But the basics are:
-Credit card and ID
-Ipod
-My really old ghetto cell phone (I can't download rings or wallpapers, oh no

)
-Pressed powder, currently almay but it'll change when I run out
-MAC studio touch up concealer pencil (everyone needs this!)
-Various lipglosses, right now Urban Decay XXX shine in Quickie and CO Bigelow tinted mentha lip shine
-Whatever eye makeup and blush I'm applying in the car that day, since I'm usually late
-Balance or Luna bar
-Diet coke or water and crystal light on the go packets
-Notebook or paper and rough copies of essays I should be working on, just in case I have downtime