My rule of thumb: it's okay to compare a maker's bags using temp ratings but not very instructive to compare ratings across makers.

Even if the Euro ratings aren't helpful WRT predicting an actual temp rating, they're at least a way to begin comparing one maker's bags against anothers.

Vaguely on topic, just got a BA Pitchpine, which is technically interesting and very light and compact. Won't know about temp range for a few months. My first encounter with waterproofed down.

Cheers,
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--Rick