Sagan XStream - Straw Filter. The only difference is how the filter connects. Never lay on your stomach struggling to get old style filter straws to the water and your mouth again. Specifications for Sagan XStream Straw Filter: Manufacturer: Sagan Color: White Weight: 1 lb Water Treatment Type: Viruses Water Filter Method: Straw Field Maintainable: Yes Features of Sagan XStream Straw Filter Light weight and easy to use The Xstream Straw Filter will filter 250 gallons of bacteria virus Giardia Cryptosporidium. Includes the multi-use XStream pump to fill up other bottles. Package Contents: Sagan XStream Straw Filter Sagan 57092: XStream - Straw Filter