The BOP by GROSCHE is a double-walled vacuum insulated water bottle made with durable 18/8 stainless steel that will not break. The thermal technology is will keep your beverages hot for up to 12 hours and cold for up to 24 hours. You can also use this insulated stainless steel water bottle for milk, juice, even tea or coffee. The BOP will hold 350 ml (11.8 fl. oz) of your drink of choice. We searched hard for the best water bottles for kids. When we didnt find one that was god enough, we designed our own. These are what we think are the best water bottles for kids.