This Chanel eau de toilette could work well for a number of occasions. The 50-ml packaging is small enough for you to bring in your carry-on on a plane.
From Notino
Chanel Coco Mademoiselle eau de toilette refill for women 50 ml
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Coco Mademoiselle eau de toilette spray refill 50 ml
ShopBetter24
Women's Perfume Chanel 116320 EDT 50 ml (50 ml)
Shopaide
Women's Perfume Chanel 116320 EDT 50 ml (50 ml)