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Hydro Flask Standard Mouth Water Bottle 21oz with Flex Cap

Style: S21SX
1 Reviews
$32.95 $26.95 to $32.95
$32.95 $26.95 to $32.95


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Hydration on the go!

The Hydro Flask Standard Mouth Water Bottle 21oz with Flex Cap is the perfect go-anywhere companion on your busiest days. It stashes easily in a small shoulder bag, your pack’s side pocket or your car cup holder and holds enough to keep you going for hours without weighing you down. The Standard Mouth 21oz is one of Hydro Flask's best selling vacuum insulated water bottles because of it's size and versatility.


  • Easy to Transport

  • Versatile, middle-of-the-road size

  • TempShield Protected

  • Keeps cold up to 24 hours

  • Keeps hot up to 12 hours

  • 18/8 Pro Grade Stainless Steel

  • BPA-Free and Phthalate-Free

  • Durable, sweat-free powder coat finish (or the Stainless option)

  • Lifetime Warranty

  • Compatible with the Hydro Flask Standard Mouth Insulated Sport Cap

Ratings & Reviews

1 review

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My favorite thing ever!!!!!!!!


I love this water bottle so much it is really good for putting stickers on it and it keeps my water the temperature I want it and I think it also looks good and uncle Dan’s is my favorite store