CUP HOLDER EXPANDER FOR OVERSIZED BOTTLES/MUGS: Now you can take your Favorite Beverage with you on-the-go! Cup Holder Adapter Expands the diameter of vehicle cup holders to accommodate your favorite larger sized beverage containers, water bottles and thermal containers that are 3.7" in Diameter or less. Fits Most Larger Containers up to 40 oz - 18-40 oz Hydro Flask Thermal Bottles, 32 and 48 oz Nalgene Bottles, 20-36 oz Yeti Insulated Tumblers and bottles, up to 40 oz Hydrocell and more. SIDE SLOT/ STORAGE -SECRET COMPARTMENT: The 1-inch slot is integrated into the design so the Thermal containers and mugs with handles will fit with ease. Secret Compartment for storing extra change, a key, or mints. Unlike other lightweight cup holder adapters, the storage area can act as a weighted base to counterbalance taller containers. Just add weight. FITS MOST CUPS - The 2-sided Flip N' Fit Disc that your beverages sit on has a Self-Centering design to accommodate different sized beverages by centering narrower containers. The Flip N’ Fit Disc can be removed to hold taller or slimmer beverages, so they are stable in your car. The disc fits under the bottom of Cup Keeper PLUS for easy storage when not in use. NO TOOLS or Installation Needed/Perfect Companion: Simply place it in your cup holder and set your mug, cup, or bottle in Cup Keeper. Works in cars, trucks, RVs, Boats, golf carts. Gadjit Cup Keeper Plus Holder provides stress-free driving since there is no rattling, and the drink is securely held in place. Stay Hydrated or Awake with your favorite beverage in a stable holder! DURABLE/PORTABLE & MADE IN USA: Gadjit’ s Car Cup Holder is made of durable high strength ABS plastic that won’t warp or crack and is unbreakable in extreme heat or cold. The sturdy base holds cups, bottles, and beverages in place during sudden breaks and prevents cups and bottles from falling. It goes where you go! Durable & Dishwasher-safe! Proudly made in the USA by a family owned and operated company! Cup Keeper PLUS car cup holder adapter expands vehicle cupholders to accommodate your favorite drinks and containers on-the-go. Stay Hydrated or Awake with your favorite beverage in a stable holder. Fits most containers up to 3.7" in diameter. Just place it in your current cupholder and place your drink in Cup Keeper PLUS. No Tools required. Its portable, move it from vehicle to vehicle. Fits 32 oz Hydro Flask, Yeti, Nalgene water bottles, insulated cups and mugs up to 3.7” diameter. The side slot allows for mugs with handles. Its Cup Keeper Plus universally designed Flip N’ Fit Disc centers beverages. Remove the disc to hold super slim beverage containers. Below the Flip N’ Fit Disc is a storage compartment that holds coins or mints -- hidden yet convenient.