Coach XL Dust Bag NWOT. The dust bag size is approximately L 25 X 24.5 W. These beautiful Coach dust bags are a great way to protect your investment. While I have a couple in different sizes, I only have these two XL ones . Please review the pictures as I have provided the measurements, approx L 25 X 24.5 W. 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!