I have heard from several people that they will only travel with bitcoin now. They travel to the middle east and and Europe frequently and said using bitcoin is much easier than trying to figure out which country uses which fiat, They said it makes traveling abroad much more fun not having to worry about carrying money on them and exchanging fiat everywhere they go. I myself do not travel much but if I ever decide to I'll be sure to bring my ledger with me, or get one of those BTC credit cards.