Katadyn has simplified the process of filtering water by putting the filter right in the water bottle. You just dip the water bottle in a stream, fill it up, then put the lid and filter into the bottle and squeeze. The filter that comes with the bottle removes bacteria and cysts, like Giardia and Cryptosporidum, which is fine for most backcountry travel. You don’t want to use this to filter questionable water in third world countries. The instructions warn that this filter does not remove viruses, and a special virus purification cartridge is available.

