Vacuum insulated stainless steel water bottles represents a premium type of bottle that is capbable is holding your drink ice cold for 24 hours or more. These are also known as hyrdo flasks or thermofalsks and are made out of a double wall food grade stainless steel which offers superior cold and heat retention. The best options offer a copper vacuum insulation, which means there is a copper lining between the two layers of stainles steel which helps distribute the heat more evenly keeping the heat or cold in your drink.Common sizes of hydroflasks range from smaller 12 ounce bottles which are great for kids all the way up to 64 ounce bottles which are great for keeping your drink cold on all day escapades. These thermoflask bottles come in many different fun and bright colors or you can opt for the tradtional stainless steel look. The hyrdo flask bottles are made with the same manufacturing process as the top retail brands such as Yeti use. Many of our stainless steel insulated bottles can be printed with your logo with rush production in as littles as 24 hours. These are the hottest promotional items since the release of vacuum insulated stainless steel tumblers, but these offer a lid to be leak-proof.