Hi @LindaElkin - Thanks for reaching out! A standard queen size down comforter should fit in a 40L stuff sack, with a little bit of room to spare. While different comforters have varied fill densities, this 45L Alps Mountaineering Compression stuff sack should work for you.
Thanks for bringing this question to the community. Hopefully this helps!
At REI, we believe time outside is fundamental to a life well lived.
