The 21 oz vacuum insulated Hydro Flask is our most versatile medium-sized water bottle and one of our most popular. With a convenient 21 oz capacity and a moderately wide mouth opening, it's great for sports drinks, juice, smoothies or water. It fits nearly any size ice cube and is easy to drink from on the go. This flask as diverse as you!
The 21 oz insulated Hydro Flask is made from 18/8 food-grade stainless steel, and the double wall vacuum insulation provides top notch insulation power, keeping cold liquids icy cold for up to 24 hours and hot liquids steaming hot for up to 12 hours.
Hydro Flask is proud that all our products are BPA-free, recyclable and backed by a lifetime warranty. Look for the H-guy and Hydro Flask logo to ensure you’re getting the market’s premium insulating beverage bottle.
Posted by John L on 04/29/2015
I use this 21oz with the flat cap every day. It will keep ice in water for almost a day. I love it. BUT the caps must be made to handle a fall. I have had two different types of hydro flasks and I handle these with care but if you use it daily it's going to drop here and there. The caps have broken on both with small 3' drops. The flat stainless cap needs to be all stainless not just the screw area. I need the durability of a solid cap to go with the perfection of the bottle!
Posted by Amanda on 04/28/2015
Love love love this product! Was given to me as a gift, and I appreciate it very much. Going to make additional purchases of other styles!
Posted by Jeff Taylor on 04/27/2015
So I wrote a review a bit ago stating that the loop on my 64oz Growler had broken after about 5 uses. Yeah, I had a new one ON my door step in under a week! AMAZING I will, with out reservation, continue to buy, use and gift these guys products. This company truly does stand behind their product. Rare these days. BUY & SUPPORT THESE GUYS/GALS!! They are the real deal! And...... their bottles are amazing!
Posted by 10sbetty on 04/27/2015
I agree with everyone's reviews about how GREAT Hydro Flask are. I have 3, as well as purchased them for gifts. My favorite is my 22oz from Dutch Bros. Unfortunately,that size is not available from Hydro Flask. So I am asking, Hydro Flask, that you either make the 32 oz wide mouth amenable to car drink holders, or the 22 oz wide mouth you make for Dutch Bros, in the fun colors! Thanks for a great product!
Posted by Adam Gallion on 04/27/2015
It is almost unbelievable how well these work. Definitely worth ordering!
Posted by Terri on 04/26/2015
Our family each has one of the 21 ounce hydro flask. We use them for kayaking, fishing, day at the shore, my son uses it for work (he works in a greenhouse). I can't believe by the end of the day after being in the hot sun that ice is still rattling around inside. I wish they came with a drinkable lid that doesn't leak.
Posted by rob on 04/25/2015
You'll finish a hot beverage before it could ever start to cool off. Even if you just sip it for hours.
Posted by Francesdunhour on 04/23/2015
Got 18oz as gift lip on lid is cracked need other
Posted by Shelly L on 04/23/2015
I came to Hydro Flask by accident... I found it in a tote that my son brought home from college. One morning when all my normal insulated coffee cups were dirty, I grabbed this 18oz flask and discovered how amazing it is! Normally, by the time I get to work my coffee is luke warm, but in the Hydro Flask it stays hot - not warm - HOT, no matter how long it takes me to drink it! I've filled it at 7:30a.m. and, after a busy morning, taken a drink at 2:00p.m. and it is still hot. It's like time stands still inside this amazing bottle. Unfortunately for my son, he's not getting it back, and I'm going to order one for my husband and get rid of my cupboard full of other bottles, cups, etc! I think I'll even buy some for gifts so all my friends can clean out their cupboards also! :) Absolutely amazing product. I love it.
Posted by Paul on 04/22/2015
Completely awesome produce. I place the mug in the fridge and can dill with an many bears I can drink and they all stay ice cold.
Posted by Deb on 04/20/2015
This flask actually works as advertised. I work long hours and am usually on the job for 13-14 hours per day with another hour or more of travel to and from work. I take the 40 oz flask to work filled with iced tea and a few ice cubes. The tea remains icy cold throughout my work day. When I get home there will still be ice cubes.
Posted by Nonnie A on 04/19/2015
This is the best water bottle EVER!! With kids who play soccer, we have gone through many many water bottles. They would get left at the field, broken when hit by a ball, taken by another player accidently... We found the Hydroflask water bottles and we LOVE them. No other player has the same one, the kids love them and are therefore responsible with them, and they are super durable. I should own stock in the company because I recommend them to EVERYONE. I will never drink from another water bottle!
Posted by Luke on 04/18/2015
Bought my first last summer on vacation in Bend at the urging of the young lady in the rafting office. Glad I made the switch! Used to use Nalgene and will not be going back. Got 4 True Pints, 3 21 oz, 2 40 oz, and the 64 oz beet growler. Extra lids are cheap and make cleaning even easier. I tell all my friends and they are one by one switching as well!
Posted by Ryan on 04/17/2015
I initially bought a black powder coated 64oz. as my everyday water bottle. I was constantly asked what I think of it (its great, keeps water ice cold all day!) Ended up picking up a 40oz. wide mouth (for water) and another 64oz. to take to the local breweries to fill, as well as a True Pint. I'm completely impressed with their line of products and their warranty policy, not to mention the 5 Percent Back program. I recommend it to anyone looking for a double-walled beverage container.
Posted by Ryan on 04/17/2015
Just picked one up for my Mom. She loves it! Keeps water ice cold all day and just the right size to carry.
Posted by Chris on 04/17/2015
This is AWESOME!!!! I had a nice ice cold Pelican Pub beer from start to finish. I put some water with ice cubes in the true pint and even with no lid ice lasted over 8 hours. Really~ so cold it makes your teeth hurt.
Posted by Slick on 04/15/2015
This is the only waterbottle i have ever had that keeps ice cubes over 24 hours. AMAZING !!!! LOVE IT
Posted by steve uetrecht on 04/15/2015
This is my 4th Hydro Flask, gave one away as gift to a friend, ran over one with truck by accident, doesn't leak but is to bent to use, and I keep 2 for my use. I think they are the best cup ever. And lifetime warranty (as long as you don't run over it).....I have had to ask for replacement lids which were sent, no questions. Thanks Hydro Flask
Posted by Theresa on 04/11/2015
This is the best bottle ever! I love it.Im rough and throw it around and drop it at my job site and it can take it.I work outside in the hottest hot and coldest cold and this bottle never feels either.To whoever reads this for a review, buy it you'll like it and to the company that made this THANK YOU FOR A GREAT PRODUCT.
Posted by Brack on 04/10/2015
This pint glass is bomber. I love the feel of the glass. Perfect for drinking on hot days. I can't believe how well it maintains the temperature of the beer you pour into it. Enhances your brew for sure.
Posted by Brack on 04/10/2015
This bad boy keeps your beer cold long after you take it out of the fridge or cooler. Took this bad boy camping and left it out of the cooler most of the afternoon and my beer was still cold. Also no sweating at all. Well at least from the Hydro Flask. Lose the glass growler and pick up one of these.
Posted by alan on 04/10/2015
I'll bet it should work really awesome! I have two 40 oz one for hot yoga and the other for the car!
Posted by Mary S on 04/10/2015
First water bottle that I didn't have to compromise when I purchased it. It was the perfect volume, I love wide mouths and a really cool color and designs. Thanks Hydro Flask!
Posted by Denita on 04/10/2015
I bought my first HyrdoFlask in 2010 and have purchased many many more since! I just returned my beloved Growler after 5 years of keeping my water COLD in the HOT HOT South Florida weather. Warranty replacement was easy, I now have my new Growler. I only wish HyrdoFlask would offer more colors in the 64 oz size.
Posted by Anthony C on 04/09/2015
Picked up a True Pint to add to my Hydroflask family of 5 water bottles. Not for beer but for coffee. And it is just as amazing as the bottles. Now I just need a lid and it would be perfect.
Posted by Tamandal1205 on 04/09/2015
I recently switched from a competitor's plastic bottle and absolutely LOVE the double-wall insulating properties of the Hydro Flask. The 32oz holds just enough ice water that I can survive the HOT Florida days. I can't wait to take mine camping... Wish I discovered Hydro Flask sooner!
Posted by Katie Brunson on 04/06/2015
I seriously wish I could give 100+ stars on this bottle. When I say AMAZING I mean it. DOES NOT LEAK. DOES NOT SWEAT. (we all can say we hate when we have a sweating bottle) I'm seriously in love and have been telling everyone about it. I left it at a friends the other night and I was so upset I left it. I highly recommend getting one. Will be ordering the straw part next!
Posted by Brooke on 04/02/2015
What an awesome water bottle! I bought one from my hot yoga studio in hopes of keeping my water cold during the class-- it totally works! I found my self using it ALL the time! I'm a college student and usually carry a water bottle around all the time anyway-- I'll put ice cold water (with half a tray of ice cubes) in it one morning and a night night the ice cubes are still whole and the water is freezing! Only buying this brand of water bottle from now on-- I love it!
Posted by Anne Marie on 04/01/2015
I got a brand new one free since the previous one had some odd rust in the bottom... CRAZY AMAZING!
Posted by Thompsie S. on 04/01/2015
I drink approximately 100 oz. of water per day (due to a medical condition). I used to use Nalgene and Camelbak bottles exclusively to carry my water to the office, the gym, etc., but I decided to try the Hydro - it caught my eye at R.E.I. on a display! I had always wanted a sleeker looking bottle that could hold more than 32 oz. but I could never find one! I own the 40 oz. Hydro Flask in blue and now I cannot wait to get a smaller pink one as well! Here is what I adore about the Hydro Flask: DOES NOT LEAK! DOES NOT SWEAT! Sleek design! Thanks so much to the designer of these bottles!!!!