NWT No flaws These bold, colorful tumblers are made to keep you hydrated in a fully functional style. Ideal for car commutes or workouts at home, it has a built-in flip straw for easy and effortless sipping. Snap it shut and the double-wall vacuum insulation will keep your drink fully leakproof and extra cold for hours. It fits comfortably in your vehicle's cup holder (treadmills and spin cycles, too!), and the folding handle lets you quickly grab and go.