A good choice for hiking and other adventures, whether you're on the move by bike or on your trail runners, whenever you want to use natural water without fear of bacteria or parasites. The soft flask packs very small, and can also be used without the filter. In addition, the filter element can be used as a drinking straw. The threads are compatible with other Peak series products. The filter element, which has been updated from the original, tolerates sand and soil better than before. - The material is twice as strong as before - Filter life: max. 2000 liters, if the treated water doesn't have much clogging material - FDA approved, meets US EPA and NSF P231 requirements for drinking water quality - BPA-free - Filters 99.999999% of bacteria, 99.999% of parasites, microplastics and sand and cloudiness - The package includes a 1 liter squeezable soft bottle, filter, cap, backflush tool and user manual *Note!* A water filter or purifier tablets cannot remove the toxins created by algae