- Standard Mouth 1.81″ opening fits the Hydro Flask Sport Cap and Standard Mouth Flex Cap
- With its double-wall vacuum insulated TempShield technology, liquids remain hot up to 6 Hours, and cold up to 24 Hours
- All Hydro Flasks are made of non-toxic BPA-free plastics & 18/8 stainless steel food-grade stainless steel
- Thanks to the proprietary powder coat, your bottle stays slip-free making it easy to go wherever you do
- Fits in most automobile cup holders and bicycle bottle racks
Hydro FlaskCarry-On Essentials
Our favorite water bottle! We own different sizes at home. During our travels, we bring the smallest size. It keeps your drink cold up to 24 hours!