The Marmot Sawtooth is a lightweight (3 lbs. 1 oz.) sleeping bag that provides heavy 600+ Fill insulation. The bag is rated to 15 degrees and the semi-rectangular shape provides plenty of wiggle room.
Marmot Sawtooth Sleeping Bag
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Here you can see the shape of the bag. It's more rectangular than it is a mummy bag. I have broad shoulders and I was able to roll over without taking the bag with me.