Hydro Flask 21 oz Leak Proof Sports Water Bottle - Standard Mouth
Hydro Flask 21 oz Leak Proof Sports Water Bottle - Standard Mouth
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HYDRO FLASK

Hydro Flask 21 oz Leak Proof Sports Water Bottle - Standard Mouth

Hydro Flask 21 oz Leak Proof Sports Water Bottle - Standard MouthHydro Flask 21 oz Leak Proof Sports Water Bottle Standard Mouth StoneHydro Flask 21 oz Standard Mouth w Standard Flex Cap WhiteHydro Flask Standard Mouth Water Bottle with Flex Cap Black 21oz 621ml

Key item features

  • Versatile Opening: Features a standard 1.81-inch mouth opening, compatible with both the Hydro Flask Sport Cap and Standard Mouth Flex Cap for diverse usage.
  • Advanced Insulation: Utilizes double-wall vacuum insulated TempShield technology, keeping liquids hot for up to 6 hours and cold for an impressive 24 hours.
  • Safe Construction: Constructed from non-toxic, BPA-free plastics and 18/8 food-grade stainless steel, ensuring safety and purity for all beverages.
  • Secure Grip: Boasts a proprietary powder coat finish, providing a slip-free exterior for easy handling and enhanced portability.
  • Convenient Portability: Designed to fit seamlessly into most automobile cup holders and bicycle bottle racks, making it ideal for on-the-go hydration.
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Customer ratings & reviews

4.4 out of 5 stars
stars29 ratings16 reviews
How item rating is calculated
  1. 5 stars72% (21)
  2. 4 stars14% (4)
  3. 3 stars3% (1)
  4. 2 stars0% (0)
  5. 1 star10% (3)

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Showing 1-3 of 16 reviews

Jul 20, 2025
anonymous
Item details
Color: Black
Sold bySyco DealsDelivered byWalmart
5 out of 5 stars review

Verified Purchase

I recently got the HydroFlask Standard Math Water Ball, and it's honestly one of the best bottles I've owned. Right out of the box, the design stood out — the math-themed graphics are fun, smart, and a great conversation starter. The build quality feels premium, with a solid stainless steel body and a powder-coated finish that resists scratches and sweat. I've been using it daily, and it keeps my water cold for over 12 hours easily, even when I'm out in the sun. The leak-proof lid gives me peace of mind when tossing it into my bag, and the wide mouth makes it super easy to clean or add ice. I also love how easy it is to grip, and the size fits well in my backpack's side pocket. The only downside is that it's a bit bulky for smaller car cup holders, but that's a small trade-off for how well it performs. Overall, I'd definitely recommend this to students, gym-goers, or anyone who wants a unique and reliable water bottle with some personality.

Incentivized Review
Helpful?5TBOCOLBTR38280433167
Jul 30, 2025
anonymous
Item details
Color: White
Sold bySave On PrimeDelivered byWalmart
5 out of 5 stars review

Verified Purchase

Cold All Day, Built to Go

I've been using the Hydro Flask 21 oz Standard Mouth, and it's been great for keeping my drinks ice-cold all day—ice usually lasts until the evening. I like that it never sweats, so I can toss it in my bag without worry. The Flex Cap is easy to twist on and off, though I'm not a huge fan of the exposed mouthpiece. It fits perfectly in my car's cup holder and side pocket of my backpack. It's tough, but I did get a small dent after dropping it—still works perfectly though.

Incentivized Review
Helpful?5TBOCOLBTR38280433167
Nov 20, 2025
Skyler
Item details
Color: White
Sold and shipped bySyco Deals
5 out of 5 stars review

Verified Purchase

great midsized bottle

good size for cup holders, not too heavy when full, great handle for carrying

Incentivized Review
Helpful?5TBOCOLBTR38280433167