Pack a Port-a-Pint in your pocket and you'll be ready to knock one back at a moment's notice. Just flick your wrist and the cup magically extends. Pour. Enjoy. Port-a-Pint comes in its own storage case. Made of high density plastic, the cup is 3.75" in diameter (at widest point), 5" tall when extended and 1.5" tall when enclosed in case. Great for camping, traveling or visiting the neighbors. The anytime, anywhere beer glass!