Packing fragrance formats
How to pack a 30ml perfume bottle safely
Pack a compact bottle so its original closure remains protected from pressure and impact. Decide whether the whole bottle is useful for the trip before carrying more fragrance than needed.
A HUME Fragrance buying guide

Keep the container intact
Do not force a fixed sprayer off for an improvised transfer. Use only an appropriate refill or transfer method.
Protect surrounding belongings
Suitable secondary containment and separation can limit consequences of an unexpected leak without guaranteeing prevention.
Check actual route rules
Use stated capacity and official current guidance rather than judging eligibility from remaining liquid.
Try this before you buy
Choose a protected bottle position and confirm that taking the whole compact bottle serves the itinerary.