Travel- or sample-size mascaras are genius because you're able to use the formula to its fullest potential, since every second liquid makeup is exposed to air, its formula becomes weakened, says Cruz.
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When packing liquid makeup products, you'll want to stick to the liquid limits we previously mentioned. You're free to pack items like mascara, brow gel, and concealer in your carry-on, as long as they're smaller than 3.4 ounces.
Pro tip: Keep your toiletries in your personal item for quick access when going through security. Make sure you know exactly what is considered a liquid before you go as some may surprise you. Mascara is considered a liquid, as is anything deemed 'spreadable.