THE COLDEST WATER BOTTLE: Stainless Steel water bottle is made of high grade stainless steel, Double Wall, Vacuum Sealed which cold water for at least 36 hours. This insulated water bottle (32 Oz) has leak proof technology and it does not sweat. The Stardust Coldest Bottle is made of 18/8 Stainless steel that is 100% BPA free and non-toxic. It will never leave a metal taste or rust. Water Bottle with Straw is available in different color and variety of sizes. Reusable water bottle is easy to handle and washable, hand wash with soapy hot water is recommended.