Eco To Go Cold Drink Tumbler - Double Wall -16oz. Capacity - Clear w/Removable Insert Double wall insulation storage space accomodates a customizable removable insert of your creation. Clear Inner Wall Liner, Clear Outer Wall, with Clear Lid BPA Free Acrylic Construction of Cup Housing and Screw on Lid, with rubber gasket seal. Reusable straw & stopper included, tumbler lid will accept standard 8mm. size straws. Hand wash. Not for microwave or freeezer use.