Travelling with fragrance
How to travel with a 5ml perfume decant
For a 5ml decant, keep exact identity and capacity information with a secure container. Travel convenience does not establish the source of the liquid or remove current baggage requirements.
A HUME Fragrance buying guide

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Record claimed maker and version so the vial does not become confused with another scent during the trip.
Check the actual container
Use closure and handling guidance supplied by the decant seller. Avoid opening or refilling it while travelling without instructions.
Review applicable rules
Check airline and airport guidance for the full itinerary rather than treating decant wording as an exemption.
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Label the decant accurately and confirm the current packing requirements for the actual route.