A close look at two sleeping bags buyers cross-shop. On the data the Flex 15 is the stronger all-round pick, and the question is whether the Neutrino Pro 500 still fits your budget or priorities.
| Katabatic Gear Flex 15 | Rab Neutrino Pro 500 | |
|---|---|---|
| GearScore | 86✓ | 65 |
| Comfort rating | 25 °F✓ | 26 °F |
| Weight | 26.8 oz✓ | 2 lb 0.3 oz |
| Warmth-to-weight | 5.9 /100g✓ | 4.8 /100g |
| Packed size | 9.5 L | n/s |
| Fill power | 850 FP✓ | 800 FP |
| Price | $429 | n/s |
| Fill | Down | Down |
| Style | Quilt | Bag |
| Shape | Quilt | Mummy |
Highlighted cells mark the better spec: Flex 15 in blue, Neutrino Pro 500 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.
Put the Katabatic Gear Flex 15 next to the Rab Neutrino Pro 500 and the trade-offs are clear. The Flex 15 is the stronger pick on most of the specs that matter, while the Neutrino Pro 500 makes its case on price.
The Flex 15 is warmer (rated 25°F vs 26°F), 5 oz lighter, and stronger on warmth-to-weight. On the default GearScore the Flex 15 leads 86 to 65.
Pick the Flex 15 if you care most about warmth and low weight, which makes it the better call for colder nights and shoulder-season trips. Pick the Neutrino Pro 500 if you would rather save the difference.
The Katabatic Gear Flex 15. It is warmer (rated 25°F vs 26°F) than the Neutrino Pro 500.
The Katabatic Gear Flex 15. It is 5 oz lighter than the Neutrino Pro 500.
The Katabatic Gear Flex 15, 86 to 65 on the default algorithm. You can re-weight the factors to match your trip.
The Flex 15 is the stronger all-round pick here. Choose the Neutrino Pro 500 if it is the better value for you.