Kelty Cosmic 20 vs TETON Celsius XXL vs ALPS OutdoorZ Redwood
Three sleeping bags at different price points. Which one actually fits your use case? Real specs, real review counts, real recommendations.
Which one should you get?
TETON Celsius XXL
7,968 reviews. Budget-friendly synthetic. Best for car camping and mild cold.
Kelty Cosmic 20 Down
117 reviews. 2 lb 10 oz. Down insulation. Best for backpacking.
ALPS OutdoorZ Redwood -25
932 reviews. -25°F rating. Best for serious cold and base camps.
Head-to-head comparison
| Attribute |
Kelty Cosmic 20
|
TETON Celsius XXL
|
ALPS Redwood -25
|
|---|---|---|---|
| Price | $139.72 | $87.71 | $184.99 |
| Temperature Rating | 20°F | 0°F | -25°F |
| Fill Type | 550 Fill Power Down | SuperLoft Elite Synthetic | Polyester |
| Weight | 2 lb 10 oz | 5 lb | 11 lb |
| Shape | Mummy | Rectangular (XXL) | Rectangular |
| Review Count | 117 | 7,968 | 932 |
| Packed Size | Compact | Medium | Large |
| Best For | Backpacking, summer camping | Car camping, mild cold | Expedition, base camps |
The bottom line
Get Kelty if...
You're backpacking and need lightweight gear. 2 lb 10 oz is a fraction of the weight. Down compresses smaller. Best for 3-season use.
Get TETON if...
You want the most validated option at the lowest price. 7,968 reviews and $87.71. Perfect for car camping and mild conditions.
Get ALPS if...
You're planning serious cold weather expeditions or need an emergency backup bag. -25°F rating handles extreme conditions.
Common questions
Which sleeping bag is warmest?
ALPS OutdoorZ Redwood -25 at -25°F is the warmest. TETON at 0°F handles most cold weather camping. Kelty at 20°F is best for 3-season use.
Down vs Synthetic: which is better?
Down is lighter, compresses smaller, and lasts longer when kept dry. Synthetic is cheaper, handles damp conditions better, and insulates even when wet. For most users, down is worth the premium for backpacking; synthetic is fine for car camping.
How do I choose the right temperature rating?
Add 10-15°F to the coldest temperature you expect. If camping at 20°F, choose a 0-10°F rated bag. This gives a safety buffer and accounts for worn insulation over time.
What's the difference between mummy and rectangular shapes?
Mummy bags are tapered at the feet and hood, making them lighter and more thermally efficient. Rectangular bags offer more room to move but lose heat faster due to extra air space.