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:

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

The 21 fl. oz. Hydro Flask Standard-Mouth vacuum bottle is ideal for keeping fluids hot or cold during weekend bike rides and hikes.


The Hydro Flask 21 oz Bottle is a stainless like no other. Fill with cold water for thirst quenching refreshment during your summer hikes or tote to the mountain and enjoy hot coffee or soup. The standard mouth features a larger opening than the original narrow mouth and is ideal for camping use with water filters and coffee cones. Made from food grade 18/8 Stainless Steel; BPA-free, highly resistant to absorbing odor, taste and bacteria Double wall vacuum insulated removes air between the two layers of stainless steel, so outside air has a difficult time affecting the temperature of your beverage and vice versa Remains hot for 12 hours Keeps cold for 24 hours Standard mouth (1.81 in / 4.6 cm) measures nearly 1 cm bigger than the narrow mouth 2.87 in diameter fits in most car, bicycle, and stroller cup holders and water bottles cages Simple to clean, don't have a liner to scratch and are completely recyclable Powder coat finish is durable, is tough to dent and stays slightly warm to the touch

- OMCgear

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

Hydro Flask works hard to provide technical, durable, and convenient water bottles for outdoor adventures, and the Tactical Line 21oz Flask is the result of all that hard work. While the color choices keep this flask low-key, the double-wall, vacuum-insulated construction keeps your coffee piping hot from the campsite to the trailhead, from the trailhead to the end of the hike, and from the end of the hike back to the campsite (up to 12 hours). Alternatively, this flask can keep cold drinks cold for up to a full 24 hours. The stainless steel used to make this bottle is BPA-free and resistant to odors and bacteria so your coffee doesn't taste like the sport drink you guzzled down yesterday.

- Backcountry.com