The Auto Drive cup holder expander adapts your vehicle's existing cup holder so it can hold a wider range of beverage-container shapes. Made of durable plastic, it's portable from one vehicle to another, so you can move it wherever you need an extra drink spot on the go. The adjustable Flip Disc base is designed to center and steady the bottoms of various bottle shapes, and when you're carrying a slim drink like a Monster or Rock Star, you can simply remove the Flip Disc for a better hold. Built-in to the expander is a hidden storage compartment, handy for stashing extra coins or mints; you can also add coins to the compartment when you want a little extra weight under a top-heavy beverage container.