I'm traveling for the holidays too and plan to fill my carry-on with homemade bars. Why not make your own? That way you can control exactly what goes into them. I use an oat base with vanilla protein powder, you should be able to find gluten free oats. There are tons of recipes out there for these kinds of bars. You can use any kind of flavor you like. My favorites are dark chocolate mint, chocolate w/ candied orange peel, mocha, tropical fruit w/ coconut, and many more. Pick a recipe that fulfills your personal nutritional needs and make a few flavors, wrap them up and you're all set.