Buy Gadjit CUP KEEPER Cup Holder Adapter (2 Pk) expands car cup holders that are 2.5?-3? wide to hold beverages that are 3.25" wide like 18, 20, 21, 24 oz Hydro Flasks, 12,18,20,30 oz Yeti Tumbler, 20, 24oz Naglene Bottles, Other Coffee & Travel Mugs with BOTTOMS UP TO 3.25" in DIAMETER (Black): Tumblers & Water Glasses - Amazon.com ? FREE DELIVERY possible on eligible purchases