Here is how these two sleeping bags compare on the numbers. They score within a hair of each other, so it comes down to the details below.
| Big Agnes Lost Ranger 3N1 15 | NEMO Soul 15/25 | |
|---|---|---|
| GearScore | 81✓ | 80 |
| Comfort rating | 27 °F | 27 °F |
| Weight | 2 lb 12.0 oz✓ | 2 lb 14.0 oz |
| Warmth-to-weight | 3.4 /100g✓ | 3.3 /100g |
| Packed size | 10.7 L✓ | 11.2 L |
| Fill power | 650 FP | n/s |
| Price | $400 | $320✓ |
| Fill | Down | Synthetic |
| Style | Bag | Bag |
| Shape | Rectangular | Mummy |
Highlighted cells mark the better spec: Lost Ranger 3N1 15 in blue, Soul 15/25 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 Big Agnes Lost Ranger 3N1 15 against the NEMO Soul 15/25 is a study in priorities. They are close enough that this really is about which handful of specs you weight most.
The Lost Ranger 3N1 15 is 2 oz lighter, stronger on warmth-to-weight, and more packable (10.7 L vs 11.2 L). The Soul 15/25 is $80 cheaper. Their GearScores land within a couple of points (81 vs 80), so neither runs away with it.
Pick the Lost Ranger 3N1 15 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 Soul 15/25 if price matter more to you, or you are focused on getting the most for your money.
The Big Agnes Lost Ranger 3N1 15. It is 2 oz lighter than the Soul 15/25.
The Big Agnes Lost Ranger 3N1 15. It is stronger on warmth-to-weight than the Soul 15/25.
They are nearly tied at 81 and 80 on the default algorithm, so re-weight the score to your own priorities to break the tie.
It depends on your priorities. Go with the Lost Ranger 3N1 15 for low weight, or the Soul 15/25 for price. The spec table above shows exactly where each wins.