Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.
Mountain Hardwear Phantom 0 and Sea to Summit Spark 0 score essentially the same (4.7 vs 4.7). Pick the one whose trade-offs match your priorities — the strengths and watch-outs below are where they actually differ.
The Phantom 0 is the expedition pick — Mountain Hardwear's bag for high-altitude winter expeditions.
The Spark 0 is the best-overall pick — Sea to Summit's lightweight zero-degree bag with 850 fill.
Expedition track record. 800 fp. Face gasket.
Best warmth-to-weight. Lightest shell. Premium.
| Spec | Mountain Hardwear Phantom 0 | Sea to Summit Spark 0 |
|---|---|---|
| Fill | ~2 lb of 800 fp down | 850 fp down |
| Hood | Cinchable | — |
| Gasket | Face | — |
| Brand | Mountain Hardwear | Sea to Summit |
| Shell | — | 10d nylon |
| Weight | — | Ultralight |