Designed to hold the 32/40 oz Hydro Flask, 40 oz 50/50 Flask and other larger bottle up to 3.8 inches in diameter for most car cup holders. | 3 INCH UPPER CUP WILL HOLD YOUR FLASK WHILE DRIVING AND MAKING TURNS... OTHER CUP HOLDERS ARE ONLY 2" and your bottle will fall out on turns! | Incorporates a one inch cut out to also hold mugs and other cups with an external handle. | Tapered base that goes from 3.2" to 2.6" to provide a snugger fit most car cup holders. | Made from high strength ABS plastic with a glossy charcoal finish.