PLEASE NOTEDThe lid is only for keeping away the dust and is without a sealthis mug is not a togo coffee mugso you could not put the mug into your bag IDEAL VOLUME 15Ounce perfect for serving ice cream coffee whiskey juice and others ELABORATE DESIGN durable double layer construction resists heat and prevents condensation HIGH QUALITYMade of leadfree borosilicate glass for ultra clarity and brilliance Absolutely no air bubble or water vapor in between the wallsup to 520F WARM REMINDEDNot a flaw There is a small hole in the bottom of the cup which is the unique trace of the manual blowing process