A small but major change has been made to the Transportation Security Administration's guidelines. As of April 7, sunscreens are now on TSA's medically-approved list of items and therefore allowed in your carry-on bag in full size. This change is thanks to the department of dermatology at Brown University, which challenged TSA on the 3.4-ounce liquid limit because sunscreen is needed to protect against skin cancer.

On the TSA's website, SPF products now sit alongside other medical items like inhalers, contact solution, and medications. But there is one disclaimer — while this change means your full-size sunscreen will no longer be confiscated at security, you will need to alert officials that you have it.

"TSA allows larger amounts of medically necessary liquids, gels, and aerosols in reasonable quantities for your trip, but you must declare them to security officers at the checkpoint for inspection," says the website.

***