This 85-ml packaging is small enough for you to bring in your carry-on on a plane. A Hermès eau de parfum could work well for a number of occasions.
From Scent Store
Hermès Twilly d'Hermès Eau de Parfum Spray - 85ml
Peacock Bazaar
Hermès Twilly d'Hermès EDP 85ml, 50ml & 30ml - Peacock Bazaar - 85ml