100% leak proof BPA free reusable refillable insulated stainless steel water bottle/flask. The ridged cap opens with just one twist, and the wide mouth provides a smooth, rapid flow. Thermoshield double walled vacuum insulated 18/8 stainless steel keeps your drink at the perfect temperature. Keeps drinks hot for up to 12 hours, or keeps water chilly cold for up to 24 hours. These drinks bottles stay sweat and condensation free. No concerns about rings on your table or dampness in your bag. The width of a can, 280ml (10oz) fits all cup holders, kid's backpacks and school lunch boxes.