What is a Quaffer? The Quaffer is the patented Double Bubble Glass Shot Glass with a built-in chaser that allows you to serve/consume bomb shots in style! The glass shot glasses measures 2.25 oz on the bottom and 1 oz on top. You put any chaser in the bottom of the glass shot glass and any liquor on top. The liquids will stay separated in the glass shot glasses until consumed. To drink... tilt your head back, let the liquids flow and enjoy... This chaser shot glass is guaranteed to be the best bomb shot glass you've ever had!