I have been on the international trips a lot. So I would like to share the checklist of mine about what I will bring in my backpack at the airport:
1) electronic bag:
camera; all chargers; headphone
2) cosmetic bag
make up remover sheets, toner, cream, overnight mask, hand cream, lip stick, sun cream
3) others:
gum, pen, sunglasses, travel pillow, hot steam eye mask, rugular silk eye mask, blanket (this is the MUST on my list for international flight), hat, travel slippers
Followings are the products I have been using ( just FYI):
hot steam eye mask: KAO Megurhythm Hot Steam Eye Mask
travel pillow: Muji Well-Fitted Neck Cushion
Hope these will give you some ideas.
Bella