I bought this bag earlier this year and have been using it for about three months. This new model above seems slightly different. I have used the bag down to 20 degrees and up to 75+ degrees so far, and it has held up well (I'm neither a hot nor cold sleeper). The stretch is less like elastic waistband than I expected, more like the straight from the dryer effect, but less sticky. I can sit comfortably with legs crossed, and transition from back to stomach to side without waking up on the zipper. One cool point -- I camp with my 35 lb. dog and she has started to climb into the bag with me in the cold morning hours. The bag stretches to fit us both and has been holding up well to her claws. I also grab the bag whenever I travel now, and more often than not, end up using it to crash on a couch, floor, or crummy motel bed. It makes the mornings that much easier. It has also cleaned up well after someone spilled a can of Black IPA on it. I recently picked up a Scale to Summit dry compression sack for it - the small is the same size as the stuff sack, pre-compression, but takes a little wrenching to fit. This bag was a solid investment; I will buy another.