Good portable water purifier for backpacking

[hollohas]

The nice thing about the Mini and squeeze is that it is threaded to go onto the plastic water bottles, in case you puncture the bag like above.

Good point. But then you're forced to carry around dirty water and use it as a filter straw. Not great if you want to fill a pot with water to make some coffee or a pot for dinner. Great for survival, not great for backcountry camping.

And I don't know anyone who carries disposable, flexible plastic water bottles while backpacking. It's hard plastic Nalgene or metal bottles almost exclusivly.