Durable 20 oz. (600 mL) MS* plastic water bottle with unique filter compartment at base of straw. Made of single wall BPA free MS plastic. Filter helps remove any dirt or debris in your drinking water without compromising the taste. Compare it to the Brita and PUR filtration systems. Designed for use with cold beverages only. Bottle is dishwasher safe, except for the filter which much be removed and hand washed. Hand wash recommended for imprinted product. Do not microwave. NOTE: Carbon filter lasts 3 months or 155L (approx 5200 oz or 40 gallons). Materials: *MS = Methyl Methylcrylate-styrene, a BPA-Free, durable shatter-resistant hard plastic.