Give up some sleeping room for weight and packability - Sea to Summit Spark SP III Sleeping Bag 850 Down

So far this bag has been good. It's warm enough, though it is a bit confining. Where it shines is its packed size and weight. It comes with a really nice storage bag and a compression bag. The compression bag is tiny, but it all fits and when compressed this thing takes up no room. I think it was worth the pack size alone.