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