We bought this set for my 13 yo daughter's room.  She has a twin sized loft bed and I was worried about having too much extra hanging off, but it tucks nicely into the ends and sides of the bed.  We bought the Wayfair Basics All Season Down Alternative Single Comforter to go inside the duvet cover and it fits nicely and isn't too bulky.  If you want something that fills the duvet cover more fully, you will want to get a comforter with more filling in it.