In the baggy I just place 1 or 2 perfume decants,
moisturizers ( in a plane you dry out like there is no tomorrow)
alcoholic whipes( when you are faced with dirty bathroom)
any medication you need to take regularly
sleeping pills if I want to sleep during a long flight
In the plane itself it´s not very nice if you go around spraying plenty of perfume, I just keep it in my check in luggage. And I don´t want to carry around a lot of handluggage, for long flights you also need to carry a book, a ds maybe, laptop always, maybe a pillow, extra clothes can be useful too.