Portable battery charger:
This is your most important gadget. It’s your life-saver; you cannot afford to leave it behind. Make sure it is in your backpack before you set off on a holiday, or else you will be stranded in the middle of nowhere with your access to the world cut off. When you are travelling and sightseeing, chances are you’ll be taking pictures and using more data than you normally do, which can leave your battery dry. Save yourself the stress and invest in a portable charger.