A cool innovation, the silver stainless steel collapsible shot glass is the perfect flask companion. With its telescopic rings and lid the metal shot glass is entirely transportable. You can go from knocking back your favorite tequila, vodka, or signature shooter to stashing the shot glass in a pocket. A fun Christmas or birthday gift, you can even give a set of the collapsible shot glasses to your groomsmen or bridesmaids for a fun bridal party favor. When collapsed, cup is 2" diameter and 1" tall. When extended, shot glass is 2" diameter and 2.5" tall.