Coach Medium Dust Bag NWOT, size approx 20 W X 17 L. Coach Dust bag (Medium) NWOT. This beautiful Coach dust bags are a great way to protect your investment. While I may have a couple in different sizes, I only have one in this size. Please review the pictures as I have provided the measurements, the dust bag is approx. 20 W X 17 L. I hope that will help determine the size that you may need. While I have listed the price, I am open to reasonable offers. All sales are final, no cancellations and no returns. I appreciate your visiting my closet, I hope you have an amazing shopping day!