Here is how these two sleeping bags compare on the numbers. On the data the Petrel UL 10 is the stronger all-round pick, and the question is whether the VersaLite still fits your budget or priorities.
| Feathered Friends Petrel UL 10 | Western Mountaineering VersaLite | |
|---|---|---|
| GearScore | 84✓ | 65 |
| Comfort rating | 20 °F | 20 °F |
| Weight | 29.8 oz✓ | 32.0 oz |
| Warmth-to-weight | 5.9 /100g✓ | 5.5 /100g |
| Packed size | 11.0 L | n/s |
| Fill power | 950 FP✓ | 850 FP |
| Price | $669✓ | $735 |
| Fill | Down | Down |
| Style | Bag | Bag |
| Shape | Mummy | Mummy |
Highlighted cells mark the better spec: Petrel UL 10 in blue, VersaLite in amber. A blank spec is never counted as a win. A lower comfort rating in °F means a warmer bag, so the warmer bag takes that row. GearScore is the overall rating (0 to 100); re-weight it on the full bag comparison. Prices are current MSRP.
The Feathered Friends Petrel UL 10 against the Western Mountaineering VersaLite is a study in priorities. The Petrel UL 10 is the stronger pick on most of the specs that matter, while the VersaLite makes its case on price.
The Petrel UL 10 is 2 oz lighter, stronger on warmth-to-weight, and higher fill power (950 vs 850). On the default GearScore the Petrel UL 10 leads 84 to 65.
Pick the Petrel UL 10 if you care most about low weight and warmth-to-weight, which makes it the better call for counting grams on long miles. Pick the VersaLite if you would rather save the difference.
The Feathered Friends Petrel UL 10. It is 2 oz lighter than the VersaLite.
The Feathered Friends Petrel UL 10. It is stronger on warmth-to-weight than the VersaLite.
The Feathered Friends Petrel UL 10, 84 to 65 on the default algorithm. You can re-weight the factors to match your trip.
The Petrel UL 10 is the stronger all-round pick here. Choose the VersaLite if it is the better value for you.