Yes, you can take an unopened box of perfume on a plane in 2026, but it must adhere to the 3-1-1 liquid rules if it is in your carry-on. This means the bottle inside the box must be 100ml (3.4 oz) or less and placed in a clear, quart-sized bag. Security officers are permitted to ask you to open the box if they cannot verify the liquid volume through the packaging. If the perfume is larger than 100ml, it must be placed in checked luggage. In 2026, "unopened" status does not grant an exemption from liquid restrictions unless it was purchased at a Duty-Free shop and is sealed in a "Secure Tamper-Evident Bag" (STEB) with the receipt visible. For 2026 travel, it is peer-recommended to wrap the box in bubble wrap or clothing within your checked bag to prevent the glass from shattering due to the pressure changes and luggage handling in the cargo hold.