I carry my tops with me. I like to pass the time between flights doing a little spinning. I always bring tops to give away to anyone who shows an interest. And, I have finger spinners for those too young or timid to throw a spin top. Also, I have a printout with string wrapping instructions and resource links for people to refer to when they get home. I've never had any issues with security, but I only carry basic trompos, nothing with long spiky tips.