* Carry-on: Hair dye in containers of 3.4 ounces (100 milliliters) or less can typically be packed in your carry-on bag. These must fit in a single, quart-sized, clear plastic bag.
* Checked bag: Hair dye can also be packed in your checked baggage without any restrictions on size.
Important considerations:
* Regulations: Always check the latest regulations of the specific airline you are flying with and the TSA or relevant security agency.
* Packaging: Secure the hair dye well to prevent leaks during transit. Consider placing it in a sealed bag or container.