Hydro Flask 21oz Standard Mouth water bottle. Durable 18/8 Pro-Grade Stainless Steel construction. TempShieldTM insulation eliminates condensation and keeps beverages cold up to 24 hours and hot up to 12 hours. Compatible with Standard Mouth Straw Lid and Hydro FlipTM Lid. BPA and Phthalate free. Twist off standard mouth cap. 21oz. Lifetime Warranty through manufacturer. Imported.