Left at 1020 on Monday around 10pm. Black, leather. Two main zipper areas (one padded for a laptop), and some additional space area in the front and the back. Nothing of particular value in the bag, just some pens, notepads, magazines, umbrellas, and little red notebook. Bag has a business card with my email and cellphone number in it. If found, please contact psl2108@columbia.edu. No questions asked.