展开Clean water with no pumping and no hassle, in no time at all. Thats the promise of the Platypus Gravityworks system, which is about as simple as it gets simply fill up the bag with water and let it flow down through the filter into your container of choice. This 2.0L version is the ultralight model, ideal for the needs of 1-4 people in the backcountry. It includes a 2L Platy Bottle to collect the filtered water and drink from when done, or you can use your own bottle or reservoir instead.