Hydro Flask water bottle 21oz (621 ml) with Standard Flex Cap — Birch

Hydro Flask water bottle 21oz (621 ml) with Standard Flex Cap — Birch is a double‑wall insulated stainless steel bottle designed to maintain beverage temperature for extended periods. The 21oz (621 ml) capacity suits daily hydration needs while the powder coat finish provides a non-slip surface that resists condensation and minor wear. The Standard Flex Cap is leak‑resistant and the wide mouth accommodates ice, easy filling and pouring.

Advantages

The double‑wall vacuum insulation reliably preserves hot or cold temperatures for hours without transferring heat to the exterior. Made from durable stainless steel, the bottle resists dents and is built for repeated use. The powder coat finish reduces sweating and improves grip, while the Standard Flex Cap offers a secure seal and straightforward one‑hand operation. The wide mouth simplifies cleaning and allows adding ice cubes or beverage mixers.

Suitable for

• Everyday hydration at home, office, or school
• Commuting and travel by car, train, or plane
• Outdoor activities such as hiking, cycling, and camping
• Gym sessions and sports practice

Key specifications

• Capacity: 21oz (621 ml)
• Material: Double‑wall vacuum insulated stainless steel
• Finish: Powder coat for improved grip and reduced condensation
• Cap type: Leak‑resistant Standard Flex Cap
• Mouth: Wide mouth for ice and easy filling
• Color: Birch

How to use

Fill the bottle through the wide mouth with cold or hot beverages, leaving some space at the top to avoid spillage when closing. Secure the Standard Flex Cap by pressing it onto the mouth until it seals; check the cap after filling to ensure the leak‑resistant closure. For best thermal performance, preheat or pre‑cool the bottle by adding hot or cold water for a few minutes and discarding before filling with the intended drink.

Usage recommendations

Hand wash the bottle and cap with warm soapy water; the powder coat exterior benefits from gentle cleaning to preserve texture. Avoid freezing the bottle or using it for carbonated drinks under pressure. Do not use bleach or chlorine‑based cleaners on the finish. Periodically inspect the cap seal for wear and replace if necessary to maintain leak resistance.