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Hydro Flask's most versatile and popular bottle, the 21oz Standard Mouth Water Bottle keeps your hot stuff hot and your cold stuff cold. 

  • Medium (standard mouth) opening
  • Double wall vacuum insulated
  • Keeps hot up to 12 hours
  • Keeps cold up to 24 hours
  • BPA-free
  • 18/8 stainless steel
  • Signature powder coat

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Hydro Flask 21oz. Standard Mouth Water Bottle

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Here's what others have to say...

Hydro flask water bottle

Hydro flask water bottle

By far the best bottle. Keeps water cold for at least 24 hours. I take it everywhere I go. Narrow enough to fit in a full backpack, it's perfect. Very light and durable. Would recommend it to anyone. Buy the hydro flask.