For $19 and approx 12oz down throw that comes with its own compression sack which is the size of a Grapefruit, can add warmth inside the sleeping bag. This thin blanket can be on top or on top of you inside the bag to keep legs warm, and core. We just purchased one at Sam's and our sign up was free. Marketed under Eddie Bauer, Well here is Ashley, she like it.
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Be wise enough to walk away from the nonsense around you!