S'well TWB-Bikin Vacuum Insulated Stainless Steel Water Bottle, 9 oz, Bikini Pink Our bottles feature triple-walled construction, designed to keep beverages cold for 24 hours or hot for 12 Our bottles are made from premium grade, BPA-free 18/8 stainless steel. Condensation-free, the exterior will remain dry. 9 oz is ideal for carrying in your bag-and it's great for kids, too! Authentic S'well products direct from the manufacturer are only shipped and sold from Amazon.com.