Originally Posted by
MoreMilesPlease
You might find that those security goons and immigration people will ask you to take it out of the cover. Some won't but you will run into a few that want it out.
YMMV, but I always travel with my passport(s) in plastic covers, and as long as the data page is separate from the cover (which it will be in any biometric passport), I've never been requested to remove it.