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Whether you’re walking along the beach in the middle of summer or climbing your next mountain for a breathtaking view, choose the Hydro Flask 21oz Standard Mouth Bottle. This water bottle is designed with a TempShield™ insulation to maintain the temperature of a cold beverage for up to 24 hours and a hot beverage for up to 12 hours. The versatile, medium-sized design is perfect to pack away in your backpack or your car cup holder, so you can stay hydrated all day long. Consider the latest Hydro Flask 21oz Standard Mouth Bottle today.