Sentence:  With gravel stuck to my cheek, I pulled myself back in the car, looked in the rearview mirror, and saw, looking back at me, a young man with a pale face and a purple <WSD>bag</WSD> under each eye. I looked pitiful ...} 
Meaning of the word marked with <WSD> tags:  A dark circle under the eye, caused by lack of sleep, drug addiction etc.