Each 28 oz (800 ML) steel bottle uses BPA-free low density polyethylene, FDA approved for food products. Bottles are reusable and light weight. Seychelle 28 oz Water Bottle with Filter The patented Ionic-Adsorption Micro-Filtration system reduces almost all contaminants in the following groups: Aesthetic Contaminants: bad taste, odor, clarity, dirt, sediment and Chlorine. Chemicals: Chlorine, toxic chemicals, detergents, pesticides and other harmful industrial and agricultural pollutants Dissolved Solids: heavy metals such as aluminum, asbestos, copper, lead, mercury, chromium hexavalent and others. Flip Top 28 oz. Seychelle Water Bottle with Filter replaces up to 757 half-liter water bottles. Stay green, get great tasting water and save the Environment!