I got home yesterday from what was supposed to be a 2 day solo trip up to the Boundary Waters area in Northern Minnesota. Going up there I knew this trip was going to be cold- Initial Impressions on first arrival of this bag.Fluffy, this bag has tons of loft for a synthetic. It is nice and fluffy. I laid it out, crawled in and within in about a minute started to sweat. It was 70 degrees in my house.The zipper on this thing is tricky. It says it is a no snag but I was having it get caught on the fabric about every 12-14 inches.Comes with a compression sack which is great at this price point. However, it does not compress down very much. Totally fine with this for the price point. I pulk a sled when I winter camp so space is not a huge deal. If you are backpacking, this took up 3/4 of my 60L pack. It will not leave much room for other stuff.- Using this bag in the field.The first night I got up it was supposed to be -26f out for a low. To think this bag by itself would keep me alive would be stupid. For the inside of this bag I put a 40f degree down top quilt from massdrop. Personally I would rate it at 30f but whatever.Underneath me I had a thermarest z lite on the ground. I think that has an R value of 1 point something.. On top of that I had the Lightspeed Outdoors self inflating sleeping pad which has an R value of 8.7. Know that in cold weather none of your self inflating stuff will inflate. You must blow it up. Also, if you plan to winter camp you will NEED 2 sleep pads to insulate you from the ground.When I went to bed at 10pm it was -32.4f outside and my tent stove kept the inside a balmy 16.7f. At 5:30 when I woke up it was -36.4 outside and my stove had long burned out and it was -30.4 in my tent. I was totally warm and not uncomfortable in the least. I would have taken a picture but there was no way I was opening up my bag to stick my arm out and let cold air in.That night while crawling into the bag and zipping up, I again had some issues with the zipper. It kept getting caught in the material. You really need to go slow and use your other hand to make sure things are not snagging. Not always easy to do while in a sleeping bag.The fit of the bag is great. I have broad shoulders, am 6'2" and 190lbs. I did side sleep part of the night and still kept warm.Even with its short comings of tricky zipper and not compressing down much. You will not find a better deal on a 0 degree bag for under $100 bucks.Btw, I only ended up doing 1 night. The next day, the Park Ranger came by and said it was going to be 40+ below the next night so I opted to play it safe and leave. The temp there actually got down to -49f so I'm glad that I left.HIGHLY RECOMMEND!!!