MSR WaterWorks EX Water Filter

At $120 the MSR WaterWorks EX Water Filter may not seem cheap but when it will turn thousands of liters of lake, stream, or even puddle water it to clean drinking water it is cheap. The bottom of the filter will screw onto Nalgene and similar wide-mouth bottles or a MSR Dromadary, so you don't have to hold them and the filter while pumping, this also prevents cross-contamination with unfiltered water, and spillage. At only 540g it weighs less than one liter of water. It purifies down to .2 microns that is smaller than any bacteria. It is a filter that removes bacteria, so it uses no bad tasting chemicals. It will need to be cleaned after every trip, or sooner depending on how much and how dirty the water you are filtering. It isn't hard to clean and it comes with every thing you need to clean it and test you filter as well as a caring bag. Replacement filters are $40-$50 but I have not needed to replace mine yet and I have hade mine for three years or approximately 50 camping trips.

It costs $0.18 a liter of purified water, I would like to see where you can get bottled water for that price. Because you don't have to carry all you water from home you will have less weight, and you have more room for food. You can seriously extend you hiking trips with this filter.