I doubt that most customs officials are looking for evidence of bitcoin these days. That may change in the future, but for now I think Poker Player might be overthinking the issue.
Depending on the country, I'd be more concerned about unlawful searches. I've been to countries where anything of value (up to cup noodles) gets "confiscated". You don't want those people to suspect you own Bitcoin.
I didn't think of that, but very true.
As for confiscating cups of noodles, that doesn't surprise me at all; they're a notorious way of hiding C4 (plastic) explosive in a seemingly innocent looking package. If you value your cups of sodium as much as I do, eat them before you arrive at your destination.