Anthracite 20 Alpenglow Sleeping Bag

Enjoy superior rest after a long day outside with this Big Agnes 20°F sleeping bag. It’s lightweight and comfy for backpacking and camping. FireLine™ Pro Eco synthetic insulation keeps you warm.

From Big Agnes:
For 25 years, we’ve been the Mother of Comfort for campers and adventurers. The EST 2001 limited edition collection features a print inspired by the Zirkel Wilderness, home to Big Agnes Mountain. This wilderness fuels our innovation and serves as our performance testing ground.

Temperature ratings are intended as a guideline to help you compare products, rather than a guarantee of warmth, since many different factors contribute to your comfort while you sleep. Backpacking bags are typically rated for temperature according to an independent testing protocol—currently International Organization for Standardization (ISO) 23537, though some older items followed European Norm (EN) 13537. Testing is based on a person wearing one base layer and a pair of socks, sleeping on an insulated surface with a minimum R-value of 5.38.

Each bag then gets 2 ratings: the Comfort rating is the lowest temperature at which the bag will keep the average “cold sleeper” comfortable, and the Lower Limit rating is the lowest temperature at which the bag will keep the average “warm sleeper” comfortable. Some brands determine their own temperature rating by aligning to the Comfort rating for women’s bags, to the Lower Limit rating for men’s bags, or somewhere in the middle for nongendered bags.