Traveling for extended period of time calls for especially meticulous planning, both for your itinerary, as well as what all to pack as your luggage. In the case of gadgets, especially, you can't really afford to miss out on any essentials as that would make for either a low-quality substitution, or an expensive replacement. Here are some gadgets considered essential nowadays for seasoned travelers:
A compact notebook PC
Especially important for those looking to travel for long durations, a nice, compact and sufficiently powerful notebook PC is crucial to make notes, keeping a journal, finding and taking up work online while traveling, entertainment, and, of course, communication. Make sure you have an active global warranty, backup storage, and insurance, too.
RFID wallets or cases
These could really save you by blocking out attempts to hack into the personal information in your cards, passport, memory chips or other items. Often having military grade protective functions, you can keep your valuable documents, etc. in these cases and rest easy.
Sturdy noise canceling ear/headphones
With the amount of flying you might be doing, keeping a good pair of noise canceling headphones or earphones is an excellent idea to allow you to pass the many hours you intend to fly in peace. Although Bose, Beats and other premium brands make for the best quality, you can find excellent alternatives in Sony or others, without too great a compromise.