Ocha Glass Infuser Bottle 400ml (Grey)Glass Infuser Bottle 400ml with Material Grip Finish (Grey). Made from quality borosilicate glass, this infuser bottle features an easily removable stainless steel infuser that fastens into the base of the bamboo look lid. To Use: Place 1 teaspoon of tea into the infuser and screw it onto the base of the lid. Pour in cold or hot water, then securely fasten the bamboo lid onto the bottle. For optimal infusion, you can optionally stand the flask upside