The 100 ml packaging is small enough for you to bring in your carry-on on a plane. This Bvlgari EdT could work well for a number of occasions.
From Lookfantastic
BVLGARI Omnia Crystalline Eau de Toilette 100ml
Parfumdreams
Bvlgari Women's fragrances Omnia CrystallineEau de Toilette Spray