Snap the Trinken Lid on the top of your can and pop it in the collapsible cup to form the Ultimate Stealth Can Cooler. By suspending your can in the cup, it keeps it cold longer than a regular beer holder with the added bonus of being discrete. People loved our Trinken lid, but kept asking us for a reusable cup so we made a lightweight (2oz) cup that collapses down to within an inch and half so you never have to look for a cup again. Simply throw it in your pocket or purse and you're good to go. The cup is also great for camping or any where else you want to bring a lightweight cup.