This best-selling, middle-of-the-road size bottle stashes easily in a small shoulder bag, the side pocket of a backpack or your vehicle's cup holder. Features a standard mouth opening for easy, on-the-go sipping. Stainless steel construction won't retain or transfer flavors and is tough enough to take on any adventure. Double-wall TempShield insulation eliminates condensation and keeps beverages cold for up to 24 hours or hot for up to 12 hours. Honeycomb Insulation inside the twist-off cap provides additional temperature control.