I like the way the Big Agnes Air Core Mummy mattress slips into the bottom. I also like the sleeve to hold soft clothes for a pillow. I also like the extra girth - it makes it easier to wear extra clothing to bed to use the bag in colder temperatures. It isn't a very warm bag relative to the weight. I bought two bags and both weighed more than the manufacturer's stated weight. Overall, I think they are a good value.
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