From picnics to road trips, Hydro Flask's 64 oz Wide Mouth ensures there is enough refreshment to go around. Hydro Flask's largest hydration bottle will help you stay cool and hydrated all day long. Replacing the existing cap on all Hydro Flask's Wide Mouth bottles, the Flex Cap is the ideal combination of strength and flexibility. Designed for ultimate portability, Hydro Flask crafted every detail with easy-carry comfort in mind – and insulated it too– so you can go further, for longer, keeping your favorite beverage comfortably by your side. Large ounce capacity for those long day and overnight trips 64 oz. water bottle - keeping water cold for up to 24 hours!