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Cosmic Down 0 Degree - Long Length

Remember the trapezoid from 10th-grade geometry? Turns out, this funky ol’ shape is ideal for helping sleeping bag baffles retain heat. The trapezoidal baffle construction improves on our best-selling Cosmic sleeping bag—and it’s just one of the reasons the Kelty Cosmic Down 0 is still our favorite three-season superstar. We also love the natural-fit foot box for happier feet, and a PFC-free water-repellent coating for a healthier environment.

  • Innovative trapezoidal baffle construction = thermal efficiency
  • Lightweight and warm 550 fill down
  • Environmental and health friendly C0 and PFC-free DWR fabrics
  • Zippered internal stash pocket for headlamp, cell phone or actual… stash
  • Buttery-soft and durable 20D Nylon shell fabric
  • Zipper draft tube with anti-snag zipper design makes it easy to get in and out
  • Dual slider for ventilation with locking zippers
  • Natural fit spacious footbox = more room to wiggle your toes
  • Comes with stuff sack for quick departures
  • ISO Comfort Rating: 17° / -8°C
  • ISO Limit Rating: 4° / -16°C
  • ISO Extreme Rating: -34° / -37°C
  • Fits to: 6' 6" / 198 cm
  • Weight: 4 lb. 13 oz. / 2.18 kg
  • Fill weight: 41.55 oz. / 1178 g
  • Stuffed size: 10" x 19" / 25 x 48 cm
  • Insulation: 550FP Duck Down
  • Shell material: 20D 400T Nylon
  • Liner material: 50D 300T Polyester




  • Size = Long

Item Number: 4852-79

Item ID: 132086

Category: Cosmic Down 0 Degree


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