Gadjit Cup Keeper 2-Pack (Tan) Car Cup Holder Adapter Expands Cup Holders to Hold Mugs, Convenience Store Cups, Water + Soda Bottles with up to 3.6" diameter, Fits Yeti Rambler 20 oz 30 oz Want to Easily Expand your Vehicle's Cup Holder? Try Cup Keeper! Allows a mug, cup, or bottle to fit in your vehicle's standard cup holder. Color: Tan/Beige Fits Most Cars No installation needed. Just place in standard cup holder. Dimensions: 3.6" diameter top of cup, 3.375" diameter bottom of cup. Portable -- move from one vehicle to the next.