And then, of course, 16 ounces is somewhere in between. The type of lid on your travel mug can make a fairly big difference in how you experience drinking. Some have bigger openings, some smaller.

Stanley is recalling approximately 2.6 million of its switchback and trigger action stainless steel travel mugs ... black and green, in 12 oz., 16 oz. and 20 oz. sizes with a polypropylene lid.