Stretch shoe laces allow you quickly take your shoes off at the airport or at any other place where you need to quickly take off your shoes.
Towel, which retains moisture for several days and will help you keep the body clean during the long trip.
Case for smartphone with a compartment for SIM cards.
You can store the SIM cards in a cover with a small pocket safely.
TravelCard is a small charger for mobile gadgets that can provide you with a 5 hours of battery life for your smartphone.