Hydroflask 21oz Standard Mouth (621ml) with Flex Straw Cap

More hydration for more fun with our leakproof, Flex Straw Cap. Our 21 oz Standard Mouth with Flex Straw Cap is just the right size for staying hydrated before, during and after activity. Beverages stay cold for 24 hours and hot for up to 12. The Flex Straw Cap is leakproof and makes it easy to sip on the move.

Flex Straw Cap makes cold refreshment that much easier

Flex Straw Cap is leakproof when closed, to transport without worry

Flex Strap is easy to transport and comfortable to carry

Honeycomb™️ Insulated Cap Insulated Cap for maximum temperature retention

Made with 18/8 pro-grade stainless steel to ensure durability, pure taste and no flavor transfer

TempShield®️ double-wall vacuum insulation keeps beverages cold up to 24 hours and hot up to 12 hours

Color Last™ powder coat is dishwasher safe, keeping your bottle slip-free and colorful

Dishwasher safe

BPA-Free & Toxin-Free

Free from toxins, free from worry

Care and Use

 Not for use on a stove, in a microwave or freezer.

Not intended for use with carbonated beverages.

Flex Straw Cap not intended for use with hot liquids

Keep hot liquids out of the reach of children.