Kelty Cosmic 0° Sleeping Bag Long | 550 Down, Cold Weather Insulation for Winter Backpacking

Kelty Cosmic 0° Sleeping Bag (Long) – Winter Ready, Backpacking Optimized

When the temperature drops, you want reliable warmth without sacrificing packability. The Kelty Cosmic 0° Sleeping Bag in a Long fit is designed for cold nights on the trail, whether you’re chasing alpine sunrises or remote campsite sunsets. Its long length accommodates taller sleepers, while thoughtful construction targets real-world warmth and comfort in frigid conditions.

Key design advantages

The trapezoidal baffle design minimizes cold spots and maximizes thermal efficiency, helping you stay comfortable as you settle in after a day outdoors. Inside, you’ll find lofty 550-fill down that delivers warmth with impressive loft, yet remains lightweight enough to carry on longer trips.

• Trapezoidal baffle construction provides enhanced thermal efficiency
• Lofty, lightweight and warm 550 Fill Down
• Buttery-soft and durable, fully-recycled shell and liner fabrics with PFAS-free DWR
• Zippered internal stash pocket keeps your favorite devices close at hand
• 0° full draft collar and 20° upper draft collar work to retain heat

Materials, build, and care

The shell and liner use fully-recycled fabrics with a PFAS-free DWR finish, balancing comfort with eco-conscious design. The insulated core is engineered to resist moisture and wind while remaining gentle to the touch.

• Buttery-soft, durable fabrics with eco-conscious construction
• PFAS-free DWR coating helps repel moisture
• Long length tailored for taller campers seeking extra coverage

Real-world use cases

Ideal for cold-weather backpacking, high-desert winter nights, and campsite stays where space is precious and warmth matters. Use it for basecamp sleeps, alpine routes, or multi-day missions that push into cooler seasons. For care, follow the garment guidelines to maintain loft and performance over time.