Ready for every refill.
Lightweight, durable, and just the right size, the Hydro Flask 21 oz Standard Mouth Flex Cap Bottle is your go-to for everyday hydration. Whether you’re powering through meetings or heading outdoors, it keeps your drinks cold or hot for hours—wherever life takes you.
TempShield™
Our double-wall vacuum insulation keeps drinks cold for up to 24 hours or hot for up to 12, with zero condensation on the outside.
Pro-Grade Stainless Steel
Made with 18/8 pro-grade stainless steel for pure taste, no flavor transfer, and lasting durability.
Standard Flex Cap
Leakproof, easy to carry, and built for the demands of daily use.
Proprietary Powder Coat
Durable, sweat-free finish that provides a comfortable, slip-free grip no matter where you go.
Product Benefits
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Standard Mouth Flex Cap for secure transport and comfortable carry
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TempShield™ insulation keeps beverages cold up to 24 hours or hot up to 12 hours
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Durable 18/8 Pro-Grade Stainless Steel construction
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BPA-Free and Phthalate-Free
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Dishwasher safe
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Fits most car cup holders and backpack side pockets
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Compatible with Standard Mouth accessories
Size & Dimensions
21 oz
Volume: 621 mL
Mouth Diameter: 1.91″
Diameter: 2.87″
Height: 9.4″
Weight: 11.3 oz