The Olsens never travel light. Every time I see one of them they are carrying a bag that is half the size of them. In this case, TWO.
It's Mary Kate walking through the streets of New York in a lush furry coat (I'm assuming it's fake), leather leggings and functional flat boots. With two, very excellent, very large bags. Where is she going? Doing the dash between the boyfriend's house and home perhaps? We've all been there, living out of the boot of your car because you stay at his house some nights, your house some nights. Maybe that's why she's got such large arm candy.
Looking good, whatever the case. We should all be so stylish as we wander through the streets of our home town!