Using proven pleated filter technology, this filter bottle provides easy waterflow, with carbon to reduce chemicals and make water taste better. - Meets EPA standards for removal of Giardia and bacteria - Delivers 160 refills (26 gallons) per replaceable cartridge, depending on water conditions - Reliable 0.3 micron pleated glass-fiber microfilter and granular activated-carbon offer efficient water filtration - Bottle holds 21 fluid ounces of water - Can be upgraded to a purification system for international travel with the Katadyn Exstream ViruStat Replacement Kit (Sold Separately) - Carry loop on lid lets you hook a carabiner through to attach bottle to your pack Specifications: - Weight: 7 ounces - Dimensions: 3.5 x 11 inches - Filter medium: Glass-fiber/carbon - Removes: Protozoa and bacteria - Field cleanable: Replaceable cartridges Katadyn