This is a good synthetic bag. Had a couple threads loose that kept catching my toes, but other than that I stayed very warm at 30 degrees. However, I do recommend down bag. The Marmot Sawtooth is a 15 degree down bag and is almost 1lb lighter than this bag for only $50 more. I would highly recommend going to the down bag because of weight, comfort and heat.

You can not beat this back for the price. I have used mine on countless nights with temps varying from ~25 degrees all the way to ~75 degrees. In the cold it does an excellent job at keeping warmth in. I've never been cold in it (I always wear a thermal top and bottom though). In warmer months it is still great because it vents very well and can actually help to keep you cool. I have had some minor trouble with the zipper on just one occasion, but it wasn't a big deal at all.

I purchased this bag for backpacking into the Grand Canyon from the South Rim in late September. The first night I slept in the back of my pick-up under the stars and temperatures dipped into the 30s and I was snug and warm. The next day I hiked 5000' down into the Canyon and the temperature stayed around fifty, so I unzipped the expansion feature of the bag and adjust the main zipper to create a roomy and perfectly controlled climate. The bags light weight was an added blessing for hiking out of the Canyon where weight was a primary concern. I like the larger storage sack that came with bag so it does not damage the fill when it lies in the closet waiting for the next trip. This is a great bag at a good price.

On my fire crew we were issued two sleeping bags, the Switch and the Phantom from MH. Previously, I have always known that if I am spiking out on some fire that I will sleep horribly, its just how it goes for me. First off I liked this bag compared to my old bag because it can compress super small with a little bit of work. I used this bag for the first time on a fire in Idaho where I managed to dig out a little hole to try and make myself as comfortable as I could for the restless night. Next thing I know its 1am and I'm being woken up by another crew that had started a warming fire, I just slid inside my bag and rolled over. I woke up the next morning very refreshed. The bag kept me warm (I am always cold) and the insulation on the bottom had great cushion. I used this bag many times throughout the season and loved the expansion feature so that you didn't have to feel so restricted in the sack. The only criticism I heard from other crew members were people that were getting too hot in the bag. I would recommend Mountain Hardwear to anyone, in fact I want to buy my own Switch bag for non-fire use.