When you're travelling the last thing that you want to worry about is travel insurance, so get World Nomads, and leave your worries back home.
I've used World Nomads Travel Insurance innumerable times, and I couldn't recommend them more.
NOTE: This page may contain some affiliate links. That means, simply, that I may get commissions from some of my recommendations. That being said, my opinions are fully my own.
You can buy and claim online, even after you've left home. Travel insurance from WorldNomads.com is available to people from 140 countries. It’s designed for adventurous travellers with cover for overseas medical, evacuation, baggage and a range of adventure sports and activities.