Gadjit Cup Keeper 2-Pack (Gray) 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? Cup Keeper Cup Holder Adapter FITS MOST STANDARD cup holders! Makes any size mug, cup, or bottle fit in your vehicle's standard cup holder No installation needed. Just place in standard cup holder. Dimensions: 3.6" diameter top of cup, 3.375" diameter bottom of cup. You get 2 Cup Keepers!