I am usually taking my iPad with me wherever I go. That is because it has everything on it I need to be entertained on my journeys. Traveling in an airplane, train, bus or car can be pretty boring because nothing really happens. Thus, I figured that having an iPad stocked up with entertainment before traveling is the best way to go.
I can use my iPad for all sorts of things such as watching TV Shows or movies, listening to music, reading a book, pre-writing my blog posts or stuff for work, playing games and so on. The iPad is the perfect companion for this because it has a long battery life, it is small but not too small to do all these things and not really heavy. I have noticed people looking jealous in planes when I am watching something on my iPad while they are totally bored.
If you travel a lot, this device is really practical and should definitely go in your hand luggage!