MSR"s lightest, smallest, and fastest pumping filter. The best choice for Fast & Light backcountry use. Effective against Protozoa, Bacteria, Particulate. Weight: 221 grams/7.8oz, Dimensions: 17.8 x 8.3 cm/7x3.5 inches, Filter Matrix: Hollow Fiber, Filter Pore Size: 0.2 Micron. Cartridge life is 1000 liters.