Head to head
Big Agnes Torchlight UL 20 vs Kelty Cosmic 20 (2027)
Head-to-head: Big Agnes Torchlight UL 20 versus Kelty Cosmic 20 on warmth, weight, fill power, expandable fit, and whether the premium is worth it.
Big Agnes Torchlight UL 20
850-fill DownTek warmth with expandable panels that add room on demand.
- Temperature rating: 20°F (-7°C)
- Insulation: 850-fill-power DownTek water-repellent down
Kelty Cosmic 20
The budget down bag that made 550-fill famous.
- Temperature rating (EN lower limit): 20°F (-7°C)
- Insulation: 550-fill-power DriDown
Our recommendation
Buy the Torchlight UL 20 if you backpack in cold shoulder seasons and want premium warmth, the lightest carry, and a bag that expands when you want room. Buy the Cosmic 20 if budget matters most; it delivers most of the experience for a fraction of the price. The honest difference is fill power (850 versus 550), a few ounces, and the Torchlight's shape-shifting panels.
Warmth and fill
Both bags carry a 20-degree rating, but the Torchlight's 850-fill DownTek achieves it with loft to spare, while the Cosmic's 550-fill rating runs optimistic for cold sleepers. In practice the Torchlight is the warmer, more trustworthy 20-degree bag, and its water-repellent down handles damp nights better.
Weight, packability, and fit
Torchlight UL 20 at 2 lb 7 oz and 6.5 x 8 in packed versus Cosmic 20 at 2 lb 11 oz and 9 x 13 in: the premium bag is lighter and packs far smaller. Then there is fit: the Torchlight's expansion panels add up to 10 in of girth on demand, a feature the fixed-cut Cosmic cannot answer.
Price and value
The Cosmic 20 costs a fraction of the Torchlight's premium list price, and for three-season camping above freezing the practical difference is modest. The Torchlight justifies its premium if you use the warmth, the packed size, and the expandable room; otherwise the Cosmic is the rational buy.
Choose Big Agnes Torchlight UL 20 if…
- You backpack in spring and fall when nights drop near freezing
- You are a side sleeper who wants room without a bulky bag
- Packed size and base weight matter to you
Choose Kelty Cosmic 20 if…
- Budget is the deciding factor
- You camp mostly in summer and mild shoulder seasons
- You are buying a first bag and learning your preferences
Questions, answered
Which is warmer?
The Torchlight UL 20 in real-world comfort: both are rated 20 degrees, but its 850-fill down lofts more and its rating is the more trustworthy of the two.
Is the Torchlight worth the premium?
For regular backpackers in cold conditions who value the expandable fit, yes. For occasional fair-weather campers, the Cosmic 20 is the better value.
Which packs smaller?
The Torchlight UL 20, by a wide margin: 6.5 x 8 in against the Cosmic's 9 x 13 in, thanks to higher fill-power down.