Kelty Cosmic Ultra Sleeping Bag

Fill power measures the loft and quality of the down; 800-fill is high-quality, meaning it provides excellent warmth while remaining lightweight and compressible. The 'DriDown' treatment adds a hydrophobic coating to the feathers, which helps them resist moisture and retain their loft even if they get slightly damp, unlike untreated down.

The Cosmic Ultra is rated for 20 degrees Fahrenheit, making it a solid choice for three-season use—spring, summer, and fall. While it can handle chilly shoulder-season nights, it is not designed as a dedicated winter bag for sub-zero temperatures.

Trapezoidal baffles are internal chambers that hold the down insulation in place. This specific shape prevents the down from shifting or clumping, which eliminates cold spots and ensures the insulation stays evenly distributed around your body to trap heat effectively.

While mummy bags are designed to be snug to maximize heat retention, the Cosmic Ultra features a spacious footbox that allows for more natural foot positioning. This extra room helps reduce that restrictive feeling often associated with traditional mummy shapes.

No, the bag uses a C0 and PFC-free durable water-repellent (DWR) finish. This is an eco-friendly treatment that protects the shell from moisture without relying on the harmful perfluorinated compounds found in older water-repellent technologies.

Yes, it includes a compression stuff sack. This allows you to cinch the bag down to a smaller, more manageable size, making it easier to fit inside your backpack alongside your other gear.