The Hydrapak Ultraflask Speed 600ml is a lightweight, vest-compatible hydration flask designed for runners and outdoor enthusiasts who need convenient access to water without adding unnecessary weight. As the largest model in the UltraFlask Speed series, its 600 ml capacity provides additional hydration for longer runs, races, and outdoor activities.

Made from soft, flexible TPU, the flask fits snugly into most hydration vest and running pack pockets. As you drink, the flask shrinks down, helping minimize water movement while keeping the bottle compact and comfortable against your body.

The UltraFlask Speed 600ml is equipped with Hydrapak’s SpeedFill™ cap, making refills faster and more convenient during races and aid-station stops. With a weight of only 46 g, it is an excellent choice for runners looking for lightweight hydration that is easy to carry.

Key Features

• 600 ml / 20 fl oz hydration capacity
• Lightweight design weighing only 46 g / 1.6 oz
• Soft TPU construction fits snugly into most vest pockets
• Shrinks as you drink to minimize water movement
• Designed for running packs and hydration vests
• SpeedFill™ cap for quick and convenient refills
• Compatible with 42mm Filter Cap
• Flexible and packable design
• Durable TPU construction
• Suitable for running, racing, hiking, and outdoor activities

Vest-Compatible Hydration for Running

The Hydrapak Ultraflask Speed 600ml is designed to fit comfortably into most running vest and pack pockets. Its soft construction allows the flask to conform to the available space, providing convenient hydration without the rigid shape of a traditional bottle.

Soft Flask That Shrinks as You Drink

The flexible TPU construction allows the flask to shrink as the water level decreases. This helps minimize water movement inside the flask and keeps the overall package compact throughout your run or adventure.

SpeedFill™ Cap for Fast Refills

The SpeedFill™ cap is designed to make refilling quick and easy. This is particularly useful during races and aid-station stops, where saving time and getting back on the course quickly can make a difference.

Lightweight 600ml Capacity

With a capacity of 600 ml / 20 fl oz and a weight of just 46 g / 1.6 oz, the UltraFlask Speed offers a useful balance between hydration capacity and low weight. The larger 600 ml size provides more water for longer activities while maintaining a lightweight design.

42mm Filter Cap Compatibility

The Hydrapak Ultraflask Speed 600ml is compatible with a 42mm Filter Cap, providing additional flexibility for outdoor hydration and water filtration setups.

Durable Lightweight TPU Construction

Made from TPU, PP/POM, and silicone, the flask combines flexibility with durable construction for regular use. Its lightweight design makes it suitable for runners and outdoor users who want reliable hydration without carrying a bulky bottle.

Technical Specifications

Lightweight 600ml Hydration Flask for Runners

The Hydrapak Ultraflask Speed 600ml combines flexible TPU construction, low weight, vest compatibility, and a convenient SpeedFill™ cap in a practical hydration solution for running and outdoor adventures. Its soft design shrinks as you drink, helping minimize water movement while providing easy access to hydration when you need it.

Shop the Hydrapak Ultraflask Speed 600ml at Backpackers Outdoor and stay hydrated with a lightweight flask designed for running, racing, and outdoor performance.