I received this product in exchange for an unbiased review - you can see the full review on DirtbagDreams.com when it is published.The zipperless design of this bag is a really interesting feature that works surprisingly well. The "comforter" as they call it has a corner that tucks nicely into your shoulder to help keep it from falling out. It wraps around you pretty easily; however if you sleep on your right side or on your stomach it can be a bit tricky to wrap the comforter around you. The foot vent (see pics) is an interesting addition that allows you to stick your feet out of the bottom without having to bend over to reach a zipper. I found this helped me stay mostly asleep instead of waking up.A feature I was really looking forward to was the sleeping pad sleeve on the back of the bag. Unfortunately my 25" wide pad did not fit in the sleeve - only 20" pads will fit. I think if you had a proper-sized pad the sleeve would work nicely. Additionally, the part where the sleeve attaches to the bag has no insulation at all. I assume this is because Sierra Designs was counting on the user having a warm pad - just something to be aware of.The bag is a little chunky, but that is to be expected with synthetic insulation. I weighed it on a kitchen scale at 3lbs 6.6oz (~1550g) - not exactly ultralight, but not the heaviest bag either. Since it is summer, I wasn't able to test the lower limits of the sleeping bag; however, I'm pretty confident that it will keep me warm.Overall I'm satisfied with the bag, and I'm looking forward to trying it in colder weather. My complaints are fairly small; wish I could rate it 4.5 stars.Pad sleeve does NOT accommodate a 25” pad!