Each item must be 3.4 ounces (100 milliliters) or smaller, and all items must fit in one quart-sized, clear, plastic, sealable bag per passenger. The bag must be placed in a clear, plastic, sealable bag and placed in a carry-on bag or checked bag. I know that nail polish doesn't ?dry?, it cures.

When flying in 2026, you can pack nail polish in either your checked luggage or your carry-on bag, but the rules for each are different. If you put it in your carry-on, it must follow the TSA "3-1-1" rule: the bottle must be 3.4 ounces (100ml) or less, and it must fit inside a single, clear, quart-sized plastic bag along with your other liquids. Most standard nail polish bottles are only 0.5 ounces, so they easily qualify. If you pack it in your checked bag, there is no size limit, but you must ensure the bottle is tightly sealed and protected from breaking. Because nail polish is flammable and considered a "hazardous material" in large quantities, you are generally limited to a "reasonable" personal amount (usually under 0.5kg or 500ml total for all toiletries). A "pro-tip" for 2026 travelers is to place the polish bottle inside a small snack-sized Ziploc bag and then wrap it in a sock; this prevents a catastrophic mess if the bottle breaks or leaks due to the pressure changes in the cargo hold. Always avoid using or opening nail polish while on the plane, as the strong fumes are a major irritant in the enclosed cabin air.