Kelty Cosmic Down 20 review

The Cosmic Down 20 is the value pick for campers who want down without paying premium prices. Kelty rates it at 20°F / -7°C and fills the Regular with 16.4 oz of 550 fill down, for a total weight of 2 lb 7 oz and a stuff sack of 8 by 13 inches. That is about 10 oz more than the Therm-a-Rest Parsec, but the price is $189.95, around $280 less. Kelty uses trapezoidal baffles to limit cold spots, a full draft tube and collar, dual locking sliders for venting, and an expanded footbox. The shell is recycled 20D nylon taffeta with a PFAS-free DWR. The bag comes in Short, Regular and Long, with the Short at $179.95. Kelty describes the shape as semi-rectangular, though the 62 inch shoulder girth on the Regular is close to a mummy cut. The 20°F number is a single rating, so do not expect it to feel comfortable right down to 20°F.

Who it is for

beginner backpackers on a budget who still want down

Price

$189.95 for the Regular at the Kelty store when checked; Short $179.95.

$189.95 Size : Regular
Quoted from the vendor pricing page on November 12, 2026.

Key features

• 20°F / -7°C temperature rating
• 550 fill down, 16.4 oz of fill in the Regular
• 2 lb 7 oz Regular, stuff sack 8 by 13 inches
• Trapezoidal baffle construction
• Recycled shell and liner with PFAS-free DWR

Strengths and weaknesses

• Strength: Cheapest down bag on this list at $189.95
• Strength: Short, Regular and Long sizes
• Strength: Zippered internal stash pocket
• Weakness: 550 fill down is heavier for its warmth than the 850 to 950 fill bags here
• Weakness: 58 inch shoulder girth on the Short and 62 on the Regular, a fairly narrow cut
• Weakness: Kelty does not publish separate ISO comfort and limit ratings on the page

Key facts

• Price: $189.95 (Regular)
• Temperature rating: 20°F / -7°C
• Weight: 2 lb 7 oz (Regular)
• Insulation: 550 fill down
• Shape: Semi-rectangular

Where it ranks

Kelty Cosmic Down 20 is No. 4 in our Best Sleeping Bags verdict.