A little more hydration lets you have a little more fun. From mountain trailheads to morning yoga practice, the Hydro Flask 24oz Standard Mouth - Flex Cap bottle is just the right size for staying hydrated before, during, and after activity. Hydro Flask's largest Standard Mouth available uses TempShield double wall vacuum insulation to keep your water refreshingly ice cold for up to 24 hours. Plus, it resists condensation, so the sides of your bottle stay dry.