Modern Innovations Double Wall Vacuum Insulated Stainless Steel Water Bottles Leak Proof Keeps Drinks Hot and Cold for Outdoor Sports Camping Hiking Cycling.Modern Innovations premium insulated water bottles: These insulated water bottles keep cold drinks cold for at least 12 hours and hot drinks hot for at least 10 hours while the outside remains thermally unaffected by its contents. Double-walled and vacuum sealed with an inner copper lining increasing thermal insulation so beverages stay hotter or colder longer.