The 3-1-1 rule costs more people their sunscreen than any other item at security. Here is exactly what size you can carry on, what counts as a liquid, what the checked-bag limits are for aerosols, and how to arrive with SPF that still works.

"Reef-safe" is not a regulated term, which means any brand can print it on anything. Here is what the science actually says, which ingredients are banned where, and how to read a label instead of trusting a badge.