"Fantastic bag" - Review of Marmot Atom Sleeping Bag: 40 Degree Down
The bag is not merely for ultralight cranks; I used it on a 5-day early-fall trip in New Hampshire with temps down to approximately 45F. Never cold. The bag was exposed to rain and dirt (never, ever use a tarp) but came through magnificently. The material feels like tissue paper but is very durable. The bag looks new after about a year of use. Loft is incredible; weight savings are great; but the real kicker is the packed size-easily down to Nalgene size. If need be, you could get it to about softball diameter. It starts a chain reaction of smaller (lighter) pack, etc, etc. The Atom is a great bag well worth the money.
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