Water filter replacement cartridge for the MSR TrailShot Microfilter and the MSR Trail Base Gravity Filter Water filter ensures that every sip is fresh, clear, and great-tasting. Hollow fiber technology allows clean filtered water to pass through while ensuring that impurities and sediments are effectively blocked. Refreshes the flow rates of any MSR TrailShot Microfilter or MSR Trail Base Gravity Filter. Ultralight (1 ounce) and compact (3x1 inches); filters 2,000 liters before needing to be replaced; manufacturer’s 3-year limited warranty.