USCG Cutter Mackinaw WLBB-30 Great Lakes Duvet Cover. United States States Coast Guard Photos, Gifts, Collectibles, Home/Bedroom Decor. Our soft microfiber duvet covers are hand sewn and include a hidden zipper for easy washing and assembly. Your selected image is printed on the top surface with a soft white surface underneath. All duvet covers are machine washable with cold water and a mild detergent.