My Travellers Favourite Gadget/Gears !

I could say i am quite geeky/edgy. Its kind of weird for some girls (prefer shoes and bags?) but anyway i love those girlie things but we are talking about gadget that a traveler must have.I've been browse around and found things that i would really have during a long journey !It should be very light and small, should had more than 1 function, and if its not too hard to ask... please.. i want