This Duvet cover is 100% cotton, twin-sized,  Pb Teen brand by Pottery Barn, in very good condition. It has one mark that I have found, see photo. I have not tried to remove it, so I'm not sure it will come out with stain remover.  The other side doesn't have a spot that i can see. The Duvet has button closure. Machine washable, tumble dry,  see label for details.

The item weighs 2 lbs, 7 ounces, so the package  will weigh a bit more.  Ships fast by USPS GROUND ADVANTAGE,  same or next business day after purchase.