Flip it. Sip it. Take it everywhere.
The 21oz (621ml) Standard Mouth Flex Straw Cap by Hydro Flask is the perfect everyday bottle when you want something compact, practical and easy to carry. Designed to fit most cupholders, it's a great size for the car, gym, office, school runs, travel and days when you're constantly on the go.
The clever Flex Straw Cap makes hydration simple - just open, add your ice and flip the straw to sip. The closeable cap is leakproof when closed, while the flexible handle makes it easy to grab and carry.
Inside, TempShield® double-wall vacuum insulation keeps drinks cold for up to 24 hours or hot for up to 12 hours. The durable stainless steel construction gives you pure-tasting drinks without flavour transfer, so your water won't taste like yesterday's iced tea.
At 621ml, it's the sweet spot between a mini bottle and a large hydration bottle - enough to keep you going without taking up half your bag.
Honestly, this is the everyday Hydro Flask size you'll wonder how you lived without.
Open the Flex Straw Cap, fill the bottle and add ice through the Standard Mouth opening. Flip the straw up when you're ready to drink, then close it securely when you're finished.
How much does the bottle hold?
The Standard Mouth Flex Straw Cap holds 621ml / 21oz.
How long does it keep drinks cold?
Hydro Flask's TempShield® insulation keeps drinks cold for up to 24 hours.
Can it keep drinks hot?\
The bottle itself can retain heat for up to 12 hours, but the Flex Straw Cap is not intended for hot liquids.
Does it fit in a car cupholder?
Yes. The 7.28cm diameter is designed to fit most standard cupholders.
Is it leakproof?
Yes. The bottle is leakproof when the Flex Straw Cap is properly closed.
Can I add ice?
Yes. The Standard Mouth opening makes it easy to add ice before closing the cap.
Is it dishwasher safe?
Yes. The bottle is dishwasher safe, making it simple to clean after everyday use.