Greystone 30 Sleeping Bag
Stay toasty in the backcountry with this down-filled Big Agnes 30°F sleeping bag. It’s ideal for backpacking but comfy enough for couch surfing. The 650-fill-power down keeps it light and packable.
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 |
|---|---|
| Tested Lower Limit | 29 degrees (F) – ISO, 29 degrees (F) – ISO |
| Tested Comfort | 38 degrees (F) – ISO, 38 degrees (F) – ISO |
| Temperature Rating (F) | 30 degrees (F), 30 degrees (F) |
| Temperature Rating (C) | -1 degrees (C), -1 degrees (C) |
| Weight | 1 lb. 13 oz., 2 pounds |
| Shell | Recycled ripstop polyester with water-repellent finish without intentionally added PFAS, Recycled ripstop polyester with water-repellent finish without intentionally added PFAS |
| Zipper Location | Left, Left |
| Insulation Type | Down, Down |
| Water-Resistant Down | Yes, Yes |
| Fill | 650-fill-power Downtek™ PFC-free down, 650-fill-power Downtek™ PFC-free down |
| Fill Weight | 12 ounces, 14 ounces |
| Sleeping Capacity | 1-person, 1-person |
| Lining | Recycled polyester taffeta with water-repellent finish, Recycled polyester taffeta with water-repellent finish |
| Sleeping Bag Shape | Mummy, Mummy |
| Fits Up To (in.) | 72 inches, 78 inches |
| Shoulder Girth (in.) | 60 inches, 63 inches |
| Hip Girth (in.) | 54 inches, 57 inches |
| Stuff Sack Size | 8 x 17.5 inches, 8 x 17.5 inches |
| Stuff Sack Volume | 14 liters, 14 liters |
| Compressed Volume | 8 liters, 9 liters |
| Gender | Unisex, Unisex |
| Sustainability | Down certified to the Responsible Down Standard (RDS), Down certified to the Responsible Down Standard (RDS) |
| Color | Cherry Tomato/Rooibos Tea |
|---|---|
| Size | Regular – Left Zip, Long – Left Zip |
| Brand | Big Agnes |
