Providing warmth down to about 18°F, the Big Agnes Bald Mountain Sleeping Bag is ideal for 3-season backpacking thanks to vertical baffles that prevent the insulation from shifting. FILL. Polyester fibers. WEIGHT. Long - Left Zip: 2 lbs. 14 oz. Regular - Left Zip: 2 lbs. 9 oz. COMPRESSED VOLUME. Long - Left Zip: 12.5 liters. Regular - Left Zip: 8.2 liters. TEMPERATURE RATING (F). 18 degrees (F)

• Pinneco Core® synthetic insulation is designed to keep you warm with a CoreScreen heat-reflective layer that is sandwiched between 2 layers of insulation
• CoreScreen reflects heat back to your body while allowing moisture to pass from the inside out so you stay dry
• European Norm (EN) lower-limit rating of 18°F makes the bag suitable for 3-season use and occasional winter outings
• Insotect Tubic construction features internal Flow Gates, which are vertical chambers with internal mesh gates that keep insulation from shifting up and down
• Insotect Tubic tubular insulation system is engineered to provide the maximum cubic loft for excellent warmth
• Mummy-style bag features full insulation on the bag's underside with no integrated pad sleeve as on other Big Agnes bags
• Ripstop nylon shell has a water-repellent finish to shed water
• Nylon taffeta lining is soft and breathable; interior fabric loops stabilize a sleeping bag liner, sold separately
• 2-way, full-length YKK zipper zips to other bags of opposite configuration
• Big Agnes Bald Mountain Sleeping Bag includes a mesh storage sack and a nylon stuff sack
• European Norm (EN) is an independent third-party temperature rating, allowing accurate comparisons across brands with other EN-rated bags