Hydro Flask 21 oz. Standard Mouth Bottle with Flex Cap

About This Item

TECHNOLOGY:

  • Proprietary powder coat for easy-grip, sweat-free, and extra-durability
  • TempShield™ protected sweat-free finish eliminates condensation, keeping hot beverages hot up to 6 hours and cold drinks cold and refreshing for 24 hours
  • Made from extra durable 18/8 pro-grade stainless steel that ensures pure taste and no flavor transfer

FEATURES:

  • Hydration bottle for the trails and everyday use
  • Standard mouth opening for easy, on-the-go drinking
  • BPA free and phthalate-free
  • Includes a lid for easy transport
  • Also compatible with Hydro Flask® Wide Flat Cap, Hydro Flip Lid and Wide Straw Lid

SPECS:

  • Capacity: 21 oz.
  • Mouth Diameter: 1.91 in.
  • Bottle Dimensions: 2.81 in. W x 9.4 in. H
  • Style: S21SX
  • Brand : Hydro Flask
  • Country of Origin : Imported
  • Web ID: 16HFLU21ZSTNDMTHFCAC
Volume621 mL
Diameter2.85"
Height11.1"
Weight12 oz

REVIEWS

4.7
94%
Recommended

1,295 Reviews

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Warranty Success!!

Thank you for helping me process my warranty for my damaged flask. The whole process went very smoothly and I appreciate it so much.

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Size And Temperature

This is the perfect size for a day on the river, a trip to town, a day at work. Easy to carry and refill. Fits in the cupholder too.

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Worth The Price

Hydro Flask bottles keep liquids cold. The wide mouth bottle allows for easy access for drinking. The bottle fits in my car cup holders and lunch box. The bottle is sturdy and keeps its shape! Highly recommend the purchase if you are looking for a water bottle.

Convenient For Travel

I have several Hydro Flask bottles and this one is the one I pick up when I'm going to travel as it fits perfectly in my backpack. It also fits pretty well in a cupholder. It's really convenient.

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A Beautiful Bottle Yet Color Starts To Wear Off

I really like the design and the blue color of the bottle. Unfortunately, after being in contact with another object (which was metallic) in my backpack, the color was damaged which is a shame because I only have this bottle for less than 2 weeks. I'll keep it but it's a bit disappointing that the color starts to wear off so quickly.

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Best Mouth Flex Cap

Gasket is easy too remove from cap to wash and clean. I like that it's simple and not like any other water bottles that have too many nonremovable/removable parts.

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We Love Our Hydro Flasks!

I bought a 21 oz Standard Mouth flask to replace hubby's that he lost on a train ride. We take them with us on weekend trips and vacations. Love them!

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Quality Is Still There

I’ve used HydroFlask products for over 10 years. The quality of design and manufacture was excellent then and remains to this day. I’m pleased to write that this company has stuck to the fundamentals to produce a good product over a long time. The engraving looked good too. I recommend.

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Top

Don't love the plastic top. It doesn't screw on and seal well

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Love My Hydro Flask

I’ve used and owned hydro flasks for 6 years now and I love them! They are the best!

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Love Them!!

Bought them for a vacation and to put in backpacks! Love them-easy and quality product

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Warranty Replacement

I was very impressed with the way Hydro Flask stood behind their product. And might I say very quickly too.

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More Bounce To The Ounce

Very nice! I should’ve bought one bigger with more ounces, which is on my list to buy!

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Love It!

Got my bottle personalized and I love it so much I will take care of it really well.

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Durable & Pretty Too!

I bought this as a gift for my daughter because I love my Hydroflask so much! It is durable, keeps my drink cold in the TX heat (no easy feat), offers a variety of styles & lids & is aesthetically pleasing too (a bonus!). Definitely a fan of Hydroflask bottles!

Read All Reviews (1,295)