The perfect size for life on the move. The Hydro Flask 21 oz Standard Mouth Bottle is designed to keep up with your busiest days. Compact enough to stash in a small shoulder bag, backpack side pocket, or car cup holder—yet large enough to keep you hydrated for hours—it’s no surprise this size is a long-time best seller.
Featuring TempShield™ double-wall vacuum insulation, this bottle keeps cold drinks cold for up to 24 hours and hot beverages hot for up to 12 hours. Made from durable 18/8 pro-grade stainless steel, it delivers pure taste without flavor transfer, and the sweat-free powder coat finish adds grip and durability.
Whether you’re commuting, traveling, hiking, or running errands, the 21 oz Standard Mouth Bottle is a versatile, reliable hydration companion you can count on every day.
Best For
- Everyday hydration
- Commuting and travel
- Hiking and outdoor activities
- Work, school, and gym use
Key Features
- TempShield™ Insulation: Double-wall vacuum insulation keeps drinks cold up to 24 hours and hot up to 12 hours.
- Portable Size: Middle-of-the-road capacity that’s easy to carry and pack.
- Durable Construction: Made with 18/8 pro-grade stainless steel for long-lasting performance.
- Pure Taste: Won’t retain or transfer flavors.
- Sweat-Free Finish: Durable powder coat (or stainless option) keeps hands dry.
- BPA-Free: Made without BPA or phthalates.
- Lifetime Warranty: Backed by Hydro Flask’s lifetime guarantee.
Specifications
- Capacity: 21 fl oz (621 mL)
- Mouth Diameter: 1.91 in (48.5 mm)
- Bottle Height: 10.4 in (265 mm)
- Weight: 10.4 oz (295 g)
- Material: 18/8 pro-grade stainless steel