Four-stage Filtration System - Hollow fiber filter purifies contaminants and harmful substances. - Coconut shell carbon removes chlorine and heavy metals. - PP cotton removes sand and mud. High Quality Materials and Capacity - Reusable, durable, BPA-free 22 oz bottle for safe drinking water. - Purifies up to 396 gallons (1,500 liters) of dirty water before a filter replacement is needed. Outdoor, Travel and Emergency Use - Suitable for camping and outdoor activities such as rivers or streams, international travel, or emergencies where clean water is unavailable. - Lid features a built-in mini compass and a silicone mouthpiece for comfort. - Included carabiner allows hanging the bottle from a backpack, fanny pack, bag, or belt loop. How to Use - Rinse the carbon filter for 60 seconds for first time use. - Sip a few times to help the water pass up through the filter. - Full instruction manual included. - Dishwasher safe.