We love the CARES harnesses.
We did have a bit of trouble at the Cancun airport on the way home. They have this mascot walking around. He/She is a tequila bottle with reminders in English and Spanish reminding you to check anything over 3oz of liquid. My kids saw the mascot and became excited. They asked us what its name is so we told them "tequila" and snickered. Then the kids started saying, "Come back Tequila! We want to see more Tequila!" Everyone around us was laughing.
I did have to explain this entire episode to the kids' teachers. Kids often say things that are strange out of context, but asking for more tequila really deserved a little warning.