This dual-use lid of insulated tumblers, not only can you open the lid and drink directly from the flip lid, but also insert a stainless steel straw in the middle and drink coffee.
The interior...
28-ounce capacity (Note: measurement markings only go to 22 ounces)
Patented mixing system uses 316 surgical-grade stainless steel BlenderBall wire whisk found only in BlenderBottle brand shaker...