"Clean Eating on the Road Tip #4: BE AWARE of what they might take away from you if you are crossing a border or getting on a plane, and don’t bring it. You can always hit up a grocery store for some of your needs! Meats and produce often can’t cross a border, and if you’re getting on a plane, remember peanut butter, greek yogurt, protein pudding and so on are often considered ‘gels!’
Note: If you are travelling somewhere like Mexico where drug dogs may greet you in the airport, have your food easily accessible to present to the officials - I have on many occasions seen drug dogs get up on someone’s bag over a sandwhich!"
— Eating Clean on Vacation/Road Trips by Bry Jensen