21 oz Standard Mouth w/ Sport Cap
Hydration on the go.
They're pretty much the perfect pair—our 21 oz Standard Mouth Bottle and our insulated Sport Cap. Together, they're your go-anywhere hydration companion. It stashes easily in a small shoulder bag, your pack’s side pocket, or your car cup holder, and holds enough to keep you going for hours without weighing you down.

TempShield™
Our unique double wall vacuum insulation protects temperature for hours. Cold drinks stay icy cold and hot drinks stay piping hot so you can stay refreshed for any adventure.


Pro-Grade Stainless Steel
Made with 18/8 pro-grade stainless steel to ensure pure taste and no flavor transfer - and the durable construction stands up for whatever life brings.
Proprietary Powder Coat
Our proprietary powder coat means an easy-grip, sweat-free, and extra-durable bottle that you can take anywhere.

Product Benefits
- Versatile, middle-of-the-road size, equipped with our insulated Sport Cap
- TempShield™ insulation eliminates condensation and keeps beverages cold up to 24 hours and hot up to 12 hours
- Durable 18/8 Pro-Grade Stainless Steel construction
- BPA-Free and Phthalate-Free
- Compatible with our Standard Mouth Flex Cap
- Lifetime Warranty
- Sport Cap is not intended for use with hot liquids and is not leakproof
Size & Dimensions
21 oz | |
---|---|
Volume | 621 mL |
Mouth Diameter | 1.91" |
Diameter | 2.87" |
Height | 10.4" |
Weight | 11.3 oz |
Lifetime Warranty
We stand behind our products.
Hydro Flask guarantees this Hydro Flask product with a limited lifetime warranty against manufacturer defects.
Hydro Flask supports non-profit organizations focused on building, maintaining, restoring, and providing better access to parks. Since 2017, we have been doing just that:
-
92 Non-profits supported non-profits.
-
$1.5 million Dollars donated donated.
-
26,043 Bottles donated bottles.
My bottle has a rattle has something broken inside?
Is the sports cap easy to open? My mom has arthritis and is looking for a water bottle she use easily.
what lids can be used with this bottle besides the sports cap and the flex cap?
Are you able to put ice cubes in the standard mouth bottle or is it to narrow for ice cubes to fit through the top?
So this bottle works w both the sports cap and the standard sized screw able lid?
Can anyone recommend a bike cage for this bottle? I tried a plastic one to hold the bottle but the bottle was too heavy for the plastic and broke. I now have a metal cage but the metal on metal makes a lot of noise while riding my bike.
Is anything being done about the leaky sports lid? I wanted to get one for my husbands birthday.
I see several complaints about the sports cap leaking. I want a cap that you don't have to unscrew to drink from and need the standard size to fit into my cupholder. Anyone have good experience with the sports cap or recommendations for a different one?
Do I need to purchase a straw for this water bottle or is the included sport cap all I need?
Does it have a straw in it?
Which bottle best fits into a bicycle water bottle cage holder? Could you please include photos of bicycles with a hydroflask in the bottle cage? It would be so much more helpful than your standard response to this question on the FAQ page.
I’m planning to order a hydro and would love to put stickers on it. What is the area of this hydro so I’ll know how many stickers to order? Thanks!
Will a straw lid be available for the 21oz HF?
Why does it say the bottle will keep beverages cold or hot and then say hot beverages not recommended? I find this confusing and misleading.
Are your products made inUSA?
Is the Hydroflask dishwasher safe?
what is the diameter in inches of the water bottle mouth opening? would it fit a 2.5" lid?
Can you use the sport top with hot liquids?
do you have a straw lid that fits this 21 ounce sized bottle? It says only sport top and screw off fit but we'd like the straw for my daughter for school.
will the top leak if it tips over in a bag?
Do you make flip caps with straws for the 21 oz bottle?
why you not got straw mouths for the lil bottles? huh?
I just purchased this water bottle with the sport cap (no straw). It makes a high pitched noise when I drink from it most of the time. I can't figure out why or how to make it stop making the noise. Any ideas?
I purchased a straw lid for my bottle. I cut the straw to fit but it doesn't get a suction, when I suck all I hear is air. How do I make it work? I checked the spot where the straw attaché and its on very snugly. Thanks
Can you please share height and diameter at wides point of this bottle. My new car's cup holders are ridiculously narrow. Trying to fine a bottle to work/fit.
Why on earth does my sport cap make so much noise (air) when I try to drink out of it??? I barely get any water unless I tip it far back, and even then I get half air. What am I doing wrong????
I would like to buy 21 fl oz sport hydroflask for my road bike since I don't want to drink water out of plastic bottle. Do you think it will fit in the regular bike holder? Also, is it easy to drink out of it using just one hand?
I dropped my 20 oz wide mouth bottle and dinged it on the bottom, so it now wobbles a bit when I set it down on my desk. Still works fine but it's annoying. Is that covered under warranty?
I have a 21oz HF jug I need only a replacement top. Can I buy one [sport cap] from you? (btw - your 'Nickname' requirement is stupid and no I don't wanna be a member of a nickname club, thank you)
What # plastic do you use on the flex cap? Thank you!
Hydro Flask supports non-profit organizations focused on building, maintaining, restoring, and providing better access to parks. Since 2017, we have been doing just that:
-
92 Non-profits supported non-profits.
-
$1.5 million Dollars donated donated.
-
26,043 Bottles donated bottles.