Hydro Flask 21 oz Standard Mouth Bottle

2 reviews
5-star:   2
4-star:   0
3-star:   0
2-star:   0
1-star:   0



Should be six stars. I bought two of these, one for…

Rating: rated 5 of 5 stars
Source: bought it new
Price Paid: $30


Should be six stars.


  • Maintains temp for at least 12 hours
  • Durable

I bought two of these, one for my wife and one for me. Unfortunately my daughter took one so I sort of missed out. She would fill her bottle with ice water before school and have ice water for cross country practice after school.  Water is great ice water is a luxury. My wife takes hot coffee to school and there it is still hot at the end of the day. Ice water will still have some ice in it after 24 hours and hot beverages will still be hot after 12.

Once you start using one of these you'll just keep coming up with more uses. Cold weather hike — hot broth, bag a special peak — cold beer.

Of all the water bottles we have these two are the only ones that don't ever get put away. We are always finding uses for them.


Really one of the best bottles I've used. It's made…

Rating: rated 5 of 5 stars
Price Paid: $25

Really one of the best bottles I've used. It's made from stainless steel and is vacuum insulated. Unlike other bottles I've used, the Hydro Flask doesn't sweat or get cold when I put ice cold water in it. It keeps cold stuff cold and hot stuff hot like an old-school thermos. 

I use it for hiking, biking, and camping. And I use it for my cold water or hot coffee.

Retailers' Descriptions

Here's what other sites are saying:

Hydro Flask Standard Mouth 21 oz. BottleThe Hydro Flask Standard Mouth 21 oz. Bottle is exceptional. There are going to be times when you are going to want to take your favorite hot drink or cold drink, along with you. With this Flask, you can hydrate yourself in the summer with a cool drink, and in the winter you can drink a hot chocolate to keep you toasty. This flask has double wall vacuum insulation allowing drinks to remain hot for up to 12 hours, and cold ones, for up to 24 hours. It also features 18/8 stainless steel to keep bacteria away, ensuring freshness, without any unpleasant odor or strange aftertaste. The Hydro Flask Standard Mouth 21 oz. Bottle is absolutely perfect for those who like to take along their favorite drink along, whether hot or cold.

- SunnySports

Ice cubes from standard refrigerator/freezer door ice dispensers fit perfectly through the narrow mouth. Our water bottles were developed to perform in every environment. Each Hydro Flask is hand cast from double wall vacuum insulated food grade 18/8 stainless steel, therefore they are BPA-Free and resistant to bacteria and odors. Our double wall vacuum insulation technology allows Hydro Flasks to keep contents hot for 12 hours and cold for 24 hours. Look for the silver ring on the neck of every Narrow Mouth and Standard Mouth Hydro Flask to ensure you're getting the best performing water bottle on the market. Patented Narrow Mouth. Double Wall Vacuum Insulated. Keeps Hot 12 Hours. Keeps Cold 24 Hours. BPA-Free. 18/8 Stainless Steel. Signature Matte Finish. Lifetime Warranty. Model: 24 oz. / 710 ml. Mouth Size: Narrow. Mouth Width: 1.44 in / 3.7 cm. Bottle Weight: 11.9 oz. / 337.4 g. Bottle Height: 10.06 in / 25.6 cm. Bottle Height with Cap: 11.5 in / 29.2 cm. Bottle Circumference: 9.18 in / 23.3 cm. Bottle Diameter: 2.87 in / 7.3 cm. Available Color(s): Everest Blue, Black Butte, Orange Zest, Acai Purple, Pinkadelic Pink

- Tahoe Mountain Sports

Featuring color tones perfect for a day out in the field or deep in the brush, the 21oz Tactical Line Hydro Flasks are the ideal choice for those looking for a neutral colored flask that will blend in easily with the surrounding environment. The Hydro Flask Tactical Line is specified to the exact pantones used by military and service organizations and include a tone-on-tone Hydro Flask logo. Cast from double wall vacuum insulated 18/8 stainless steel, the flasks keep contents cold for up to 24 hours and hot for up to 12. Each flask is BPA-free, resistant to bacteria and odors, and comes with a lifetime warranty.

- Ramsey Outdoor

The 21 oz Insulated Water Bottle from Hydro Flask is the perfect water bottle for a day in the wilderness or for a day spent around the city. Hydro Flask ensures that your cold beverages stay cold and that your hot beverages hot while you are on-the-go. This sleek flask is also crafted from 100% recycled material and will not absorb any flavors or odors from what you drank on yesterday's voyage. PRODUCT FEATURES: 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 Finish in 8 colors Lifetime Warranty

- Appalachian Outdoors

The Hydro Flask Standard Mouth 21 oz is ideal for taking on the weekend bike ride or hike to keep your fluids cold. Or take it up the mountain and have coffee, hot cocoa, or soup waiting for you at the end of the day. The standard mouth features a larger opening than our original narrow mouth bottle. It is ideal for coffees, teas, mixing sport drinks, or just for those who need to take in more hydration, more quickly. As with all Hydro Flask bottles, they fit perfectly in most car, bicycle, and stroller cup holders and water bottles cages. Hydro Flask Stainless Steel water bottles were developed to perform in every environment.

- CampSaver.com