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AustinKalb wrote:The differences between +10, 0, and -10 were like an inch in packed size based on the FF Website. In fact the 0 Ibis and -10 Eider call out exactly the same stuffed size, only 6 oz difference in wt.

There's something wrong with their pack size specs.

The Eider and Ibis specs have the same dimensions (7.5" x 15") but different volumes (23L vs 17L). I'm not even sure what those mean. Is that stuff sack size diameter and length and then volume in liters? Those numbers don't compute.

In any case, those two bags are virtually identical in terms of dimensions and materials. It's just that the fill and loft are greater in the Eider. So the Ibis will stuff smaller. I have 10°F and 0°F bags, both Western, and there is an obvious difference in their pack volumes.

It's Very Expensive. Better get a cheap one.