This 30-ml packaging is small enough for you to bring in your carry-on on a plane. An Escentric Molecules eau de toilette could work well for a number of occasions.
From Cult Beauty
ESCENTRIC MOLECULES - MOLECULE 01 REFILL (30ML)
John Lewis & Partners
Escentric Molecules Molecule 01 Eau de Toilette
This product is also available at 1 unverified store.