What's a Quaffer? 

The Quaffer is the patented double bubble shot glass, which is a shot glass with a built-in chaser. It measures 2.25oz on bottom and 1.25oz on top. The shape of the glass (and science) allows any liquor to sit conveniently on top of any chaser until consumed. This provides for the smoothest shot ever as well as endless combinations of delicious shot recipes. The last thing you taste is the chaser!