Fill your body with the freshest tasting water when you have the 321 Reusable Filtering Water Bottle. This bottle has a built-in filter to enhance your water. The 321 Bottle is eco-friendly and also BPA-free. It works by using a French press method. Simply fill the vessel with water and put the filter on top. As you press down, just like the classic coffee method, the water comes through the filter. Once the filter reaches the bottom, all of the water would have passed through. The 321 Bottle filter attaches to the lid. Once fully filtered, the entire system secures with the lid in place and you’re good to go. The 321 Bottle comes in four different colors to match your style.