Your perfect travel companion
Keep life moving with our 21 oz (621 ml) bottle and Standard Flex Cap. It stashes easily into a small shoulder bag, your pack’s side pocket or your car cup holder, and holds enough ice-cold goodness to keep you going for hours without weighing you down. No wonder it's one of our bestselling water bottles.

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 flavour 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
- TempShield™ insulation eliminates condensation and keeps beverages cold for up to 24 hours and hot for up to 12 hours
- Durable 18/8 Pro-Grade Stainless Steel construction
- BPA-Free and Phthalate-Free
- Compatible with Standard Mouth Insulated Sport Cap
- Lifetime Warranty
Size and Dimensions
21 oz (621 ml) | |
---|---|
Volume | 621 ml |
Mouth Diameter | 1.91" |
Diameter | 2.87" |
Height | 9.4" |
Weight | 11.3 oz (320 g) |
We have great faith in our products
Hydro Flask guarantees this product with a limited lifetime warranty against manufacturer defects.
Hydro Flask supports non-profit organisations focusing on building, maintaining, restoring and providing better access to parks. Since 2017, we have been doing just that:
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92 Non-profits supported non-profits.
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$1.5 million Dollars (approx. £1.197 million) donated donated.
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26,043 Bottles donated bottles.
Do they float? I'm looking for something with a closed lid to use on my kayak and with the possibility of flipping the kayak I would like to make sure I will be able to locate the flask if that were ever to happen.
Will this size fit in a standard cupholder?
I bought my Hydro Flask at Dick’s Sporting Goods will I still be offered the lifetime warranty?
Are any of the water bottles dishwasher safe?
I am getting a metallic taste in my water from the 21 oz flask. I’m surprised as it has 18/10 stainless steel. Is there anything that would get rid of this?
Can I use the lid with the straw for coffee in the standard mouth 24 oz bottle
Where is this bottle manufactured?
Is there a cap available for purchase that would allow me to use my standard mouth Hydro Flask 21oz with hot drinks? I purchased 2 hoping to use one for hot and the other for cold. However I have not been able to use hot drinks due to the cap. Frustrated
Hydro Flask supports non-profit organisations focusing 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 (approx. £1.197 million) donated donated.
-
26,043 Bottles donated bottles.