21oz Standard Mouth HydroFlask


Available Options

SKU: 21oz-SM-flask-ringcap Category:


The 21oz Standard Mouth bottle has the standard diameter for most cup holders! Available in the Ring Cap.

Our water bottles were developed to perform in every environment. Each Hydro Flask is hand cast from double wall vacuum insulated food grade 18/8 stainless steel, therefore they are BPA-Free and resistant to bacteria and odors. Our double wall vacuum insulation technology allows Hydro Flasks to keep contents hot for 12 hours and cold for 24 hours.


  • Patented Standard Mouth
  • Versatile, middle-of-the-road size, equipped with our insulated Ring Cap
  • Double Wall Vacuum Insulated
  • TempShieldTM insulation eliminates condensation and keeps beverages cold up to 24 hours and hot up to 12 hours
  • Durable 18/8 Pro-Grade Stainless Steel construction
  • BPA-Free and Phthalate-Free
  • Compatible with our Standard mouth Sports Cap
  • Lifetime Warranty

Additional information

Weight N/A

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