A proven classic built to keep you warm. The Cosmic Down Sleeping Bag has earned its reputation as a three-season favorite thanks to smart design, reliable warmth, and durable, eco-conscious materials. Its trapezoidal baffle construction—yes, that trapezoid from geometry class—helps trap heat more efficiently, keeping you warmer when temperatures drop.
Insulated with lightweight 550-fill down and wrapped in fully recycled fabrics with a PFAS-free DWR treatment, the Cosmic Down balances warmth, packability, and sustainability. An expanded natural-fit footbox gives your feet room to relax, while a full draft tube and collar seal in heat for added comfort.
From campsite nights to shoulder-season adventures, this sleeping bag delivers dependable performance with thoughtful details that make a real difference.
Best For
- Three-season camping and backpacking
- Cold-weather shoulder seasons
- Campers who want warmth without a mummy-tight fit
Key Features
- Trapezoidal Baffle Construction: Improves thermal efficiency and heat retention.
- 550 Fill Down Insulation: Lofty, lightweight, and warm.
- Recycled Fabrics: Fully recycled shell and liner with PFAS-free DWR for water resistance.
- Heat-Retaining Design: Full draft tube and draft collar help prevent heat loss.
- Anti-Snag Zipper: Quad-stitch construction makes entry and exit smooth and easy.
- Ventilation Control: Dual locking sliders allow customizable venting.
- Natural-Fit Footbox: Expanded shape provides more room to move and sleep comfortably.
- Internal Stash Pocket: Zippered pocket keeps small essentials close.
- Stuff Sack Included: Makes packing up quick and easy.
Construction & Materials
- Insulation: 550-fill down
- Shell Fabric: Recycled 20D nylon taffeta
- Liner Fabric: Recycled 50D polyester taffeta
Specifications (All Sizes)
- Temperature Rating: 0°F / -10°C Tested at 5°F / -15°C
- Bag Shape: Semi-rectangular
Size & Fit
Regular
- Fits up to: 6'0" / 183 cm
- Weight: 4.34 lb / 1.93 kg
- Fill Weight: 39.5 oz / 1120 g
- Length: 78 in / 199 cm
- Shoulder Circumference: 62 in / 158 cm
- Hip Circumference: 57 in / 147 cm
- Foot Circumference: 46 in / 117 cm
- Stuff Sack Size: 10" × 19" / 25 × 48 cm
Long
- Fits up to: 6'6" / 198 cm
- Weight: 4.5 lb / 2.04 kg
- Fill Weight: 41.6 oz / 1178 g
- Length: 84 in / 214 cm
- Shoulder Circumference: 64 in / 163 cm
- Hip Circumference: 60 in / 152 cm
- Foot Circumference: 52 in / 131 cm
- Stuff Sack Size: 10" × 18" / 25 × 48 cm