Vacuum insulated bottle
Product 2025
Femme, Homme, Enfant
The Hydro Flask 21 oz (621 ml) Standard Mouth with Flex Straw Cap offers the perfect volume for a full day out. It takes up relatively little space in a backpack, and its insulation keeps liquids hot for many hours — even the next day, drinks are still warm in mild conditions.
The wide mouth makes it easy to add ice cubes and simplifies cleaning.
The straw system requires tilting your head back and angling the bottle to drink, but it’s still a convenient feature since it eliminates the need to unscrew the cap for a quick sip. Just keep in mind that if you’re using it for sugary drinks, the straw system needs to be cleaned regularly and thoroughly. The lid itself is easy to screw on and off.
The anti-slip coating feels nice in the hand. While the Hydro Flask 21 oz Standard Mouth is quite sturdy, strong impacts can still dent the metal body, so a bit of care is needed.
Overall, it’s a reliable, user-friendly insulated bottle — practical for both outdoor adventures and everyday use.
We used this equipment over a long period of time
These are our thoughts after intensive use:
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