Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.
Feathered Friends Ibis ES 0 comes out ahead by a narrow margin (4.8 vs 4.7). The gap is mostly about buyers who want artisan-grade hand-built quality — read the strengths below before deciding.
The Ibis ES is the artisan pick — Feathered Friends' hand-built zero-degree bag with 950+ fill goose down.
The Spark 0 is the best-overall pick — Sea to Summit's lightweight zero-degree bag with 850 fill.
Highest fill power. Hand-built. Lifetime warranty.
Best warmth-to-weight. Lightest shell. Premium.
| Spec | Feathered Friends Ibis ES 0 | Sea to Summit Spark 0 |
|---|---|---|
| Fill | 950+ fp goose down | 850 fp down |
| Origin | USA hand-built | — |
| Weight | 50 oz | Ultralight |
| Brand | Feathered Friends | Sea to Summit |
| Shell | — | 10d nylon |