One of my first sewing projects I did was make a duvet cover for my goosedown comforter. It is King size and by itself that sucker weighs about 2 tons. I put buttons across about 3/4 of the bottom to close. But I gotta tell you of the time I dont even put the comforter in it. It is way to hot. I use it by itself on the bed. I also made matching curtains.