This 100-ml packaging is small enough for you to bring in your carry-on on a plane. Eau de toilette fragrances are less concentrated and generally don't last all day.
From Amazon
Guess 1981 Indigo by Guess for Men - 3.4 oz EDT Spray
Cosmetify
Guess 1981 Indigo For Men Eau De Toilette 100ml
Parfum France
Guess 1981 Indigo Eau De Toilette Spray Men 100