Sidewinder 20 Sleeping Bag
Price range: $263.99 through $279.99
Built for comfort, this Big Agnes sleeping bag is made specifically for people who sleep on their sides. It combines down and synthetic insulation for just-right warmth. And it compresses down small.
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.
| Best Use | Backpacking, Backpacking, Backpacking |
|---|---|
| Tested Lower Limit | 19 degrees (F) – ISO, 19 degrees (F) – ISO, 19 degrees (F) – ISO |
| Tested Comfort | 30 degrees (F) – ISO, 30 degrees (F) – ISO, 30 degrees (F) – ISO |
| Temperature Rating (F) | 20 degrees (F), 20 degrees (F), 20 degrees (F) |
| Temperature Rating (C) | -7 degrees (C), -7 degrees (C), -7 degrees (C) |
| Weight | 2 lbs. 4 oz., 2 lbs. 7 oz., 2 lbs. 11 oz. |
| Shell | Recycled ripstop polyester featuring a water-repellent finish without intentionally added PFAS chemicals, Recycled ripstop polyester featuring a water-repellent finish without intentionally added PFAS chemicals, Recycled ripstop polyester featuring a water-repellent finish without intentionally added PFAS chemicals |
| Zipper Location | Front, Front, Front |
| Insulation Type | Down / Synthetic Blend, Down / Synthetic Blend, Down / Synthetic Blend |
| Water-Resistant Down | Yes, Yes, Yes |
| Fill | 650-fill-power Downtek™ PFC-free down and FireLine™ Eco synthetic insulation, 650-fill-power Downtek™ PFC-free down and FireLine™ Eco synthetic insulation, 650-fill-power Downtek™ PFC-free down and FireLine™ Eco synthetic insulation |
| Fill Weight | 14 oz. down and 6 oz. synthetic, 15 oz. down and 6.5 oz. synthetic, 1 lb. 0.5 oz. down and 7 oz. synthetic |
| Sleeping Capacity | 1-person, 1-person, 1-person |
| Lining | Recycled polyester taffeta featuring a water-repellent finish without intentionally added PFAS, Recycled polyester taffeta featuring a water-repellent finish without intentionally added PFAS, Recycled polyester taffeta featuring a water-repellent finish without intentionally added PFAS |
| Sleeping Bag Shape | Mummy, Mummy, Mummy |
| Fits Up To (in.) | 66 inches, 72 inches, 78 inches |
| Shoulder Girth (in.) | 58 inches, 61 inches, 65 inches |
| Hip Girth (in.) | 52 inches, 55 inches, 59 inches |
| Stuff Sack Size | 8 x 17.5 inches, 8 x 17.5 inches, 8 x 17.5 inches |
| Stuff Sack Volume | 14 liters, 14 liters, 14 liters |
| Compressed Volume | 8 liters, 8 liters, 10 liters |
| Gender | Unisex, Unisex, Unisex |
| Sustainability | Down certified to the Responsible Down Standard (RDS), Down certified to the Responsible Down Standard (RDS), Down certified to the Responsible Down Standard (RDS) |
| Color | Chinois Green/Mercury/Evening |
|---|---|
| Size | Short, Regular, Long |
| Brand | Big Agnes |
