We've never had a problem taking them on the plane with us. Like others, we just put them in a gallon size ziploc and gone through security. We've always packed the Disney ones in the carryon suitcase. Now a few weeks ago DDwas traveling to a fastpitch tourney we're the teams traded pins. Her carry-on suitcase was busting at the seams with her unis, cleats, and 2 mitts so she put her trading pins in her backpack. When the guard at security saw them on the x-ray he asked what they were and why she had so many and he had her take them out and show him. She pulled them out, told them she had so many because she had hers for trading and one of her teammates (teammate broke foot and didn't go, so DD offered to trade for her), he told her good luck and let her through.