If you travel often or have someone in your life who does, they probably have it narrowed down to a few essentials they won't leave home without - especially if it's international travel.
Caudalie Beauty Elixir - $18 will refresh dull skin from travel
Caudalie Grape Water - $10 I mist this on my face periodically in flight
Noise Cancelling Head Phones - $49.99 I will be investing in these after my last flight
Scarf - $30 Airplane temperatures vary and there are germs galore so a scarf is versatile
Travel Journal - $9.99 allow them to write down their adventures with a nice notebook
Collagen Eye Pads - $64 to help under eyes mid-flight
Moisturizing Lip Balm - $6 an obvious must
Travel Neck Pillow - $15.99 to help with peaceful sleep
Tocca Hand Cream Set - $18 I can't get enough moisture in airplanes/hotels if you can't tell!
Travel Book - $30 a helpful guide for upcoming adventures
Ginger/Peppermint Essential Oils - $10 both are known to help with motion sickness/travel