Andway&reg; Insulated Double Wall Vacuum Stainless Steel Outdoor Water Bottle, 20 oz (600 ml) MATERIALThe bottle is made from food grade 18/8 stainless steel and is free of BPA, Phthalates and any other toxic chemicals VACUUM INSULATED FOR COLD OR HOT DRINKSmade from double wall stainless steel and is vacuum insulated, keeps cold drinks chilled or hot drinks warm for over 12 hours 1.6 INCHES WIDE MOUTH OPENING : 1.6 inches(40mm) wide mouth opening makes the bottle easy to add ice cubes and drink. it's easy to clean the bottle LIGHT WEIGHT AND STRAP DESIGN: light weight design and there are high quality strap on the bottle,it is convenient for carring while sporting & camping HIGH QUALITH AND DURABLE : High quality construction and fine workmanship that should give you years of use,Easy to clean, fill, and drink from