Upgrade your car's cup holder game with the Smart Kup Car Cup Holder Expander, the ultimate solution for holding your favorite beverages securely on the road. Engineered for compatibility, this cup holder adapter fits popular brands like Hydroflask (32/40 Oz), Nalgene (30/32/38/40 oz) , Yeti (20/26/36 oz Ramblers), Owala (19/24/25/32/40 oz) and more, accommodating bottles and mugs from 3.4 to 3.8 inches in diameter. Say goodbye to shallow cup holder issues as our expander features a tapered narrow base, ensuring a snug fit that eliminates rolling around during your drive. Crafted with durability in mind, the cup holder is constructed from impact and abrasion-resistant ABS plastic. The 3-inch upper cup is designed to stay in place during turns and abrupt stops, providing a secure hold for your flask, unlike other holders with a 2-inch upper cup. With a U-shape cutout, our cup expander accommodates coffee cups or travel mugs with external handles, making it versatile for all your beverage needs on the road. Upgrade your journey with Smart Kup – where compatibility, stability, and style meet.