I'm a believer in "every day carry", which to me means it's not a matter of grabbing gear because it's already on me. I'll grab my jacket before leaving, but that's because it's liable to be cold outside and there could be a 10 minute wait for the signal to be cleared.

If you have a briefcase or a pack or something, I imagine during an evacuation you'd be expected to leave it behind anyway, in case it gets in the way.