Do a search for backpacker travel insurance and you will see all the usual suspects, compare or cheap or best value or all singing and all dancing….
You are on a two year trip, how the hell are you going to afford that, travelling the world, visiting inhospitable places, dangerous places… the $$$$$ signs are piling up as we write!
Most backpackers believe that travel insurance is a luxury. But it doesn’t need to be that way.
For the budget concious, if you plan your trip properly and budget at the start for doing the right thing, take a pragmatic approach to what you need, something like: Overseas emergency assistance, whether that is medical or hospital expenses or even both.
If you have accident the ability to be transferred home (it is called repatriation in the game).
There are of course many more things you can insure, but you really do need the basics at the very least.