I had the same experience as someone posting above. I went to the store to try out a compression stuff sack on my beloved WM bag...wasn't even stuffed for more than an hr...it's loft was reduced too. I use the biggest silnylon stuff sack I can use and let my bag take a lot of my pack volume...but it stays nice and lofty! And I have a different bag for car camping, staying at my son's etc....my backpacking sleeping bag is treated special!:)