stuff sackorganizes the inside of your duvet cover making it easy to use old blankets, pillows, clothing keeping stuff out of landfills! throw the stuff sack and all of its contents directly into the washer when its time to clean the inside of your dog bed 100% nylon, fully zippered and gusseted buy extra molly mutt duvets so that a clean cover is always available! small 22" x 27" x 5" medium large 27" x 36" x 5" huge 36" x 45" x 5"