Universal adjustable cup holder expander that turns a standard car cup holder into a stable, organized spot for large drinks and slim items. Key benefits Fits more drink sizes: Expands to hold extralarge tumblers, big water bottles, and handled mugs so you can use the bottle or mug you prefer. Keeps items accessible and tidy: Builtin slim slot holds a smartphone and other flat items (cards, keys, coins), reducing clutter on the console. Stable, quiet rides: Nonslip base pad and rubber grips lock the expander in place to minimize rattle and reduce the risk of spills on bumpy roads. Simple secure installation: Twist the and bottom in opposite directions to lock the base into place or reverse to remove. Features and specifications Adjustable locking base: Simple twisttolock mechanism creates a secure fit inside the cup holder. Compatibility: Fits most standard round car cup holders with base diameters from 66 mm to 100 mm. Extrawide opening: Ushaped side cutout accepts handled mugs and wide bottles that won't fit in standard holders. Slim storage slot: Designed for smartphones and other flat items so they remain upright and easy to reach. Rattlereduction: Nonslip base pad plus rubber grips help stabilize drinks and reduce noise while driving. Practical use scenarios Daily commute: Keep your travel mug steady and your phone in the slim slot for navigation or hands calls without fumbling for loose items. Long drives or road trips: Secure large water bottles and handled mugs while preventing spills from bumps or sudden stops. Family errands or rideshare driving: Provide a versatile, stable spot for passengers' diverse drink sizes and a convenient place to store cards or keys. What you'll get A versatile cup holder expander that expands and locks into place, fits 66–100 mm cup holder bases, accepts oversized drinkware via a Ushaped side opening, and includes a slim slot for a phone and small flat items — engineered to reduce rattle and keep drinks upright during normal driving.