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A lightweight, packable flask that keeps water accessible on the move
Hydrapak says:
The perfect balance of sleek and stable, our signature UltraFlask has a wider form and a durable 3D welded bottom. Soft and pliable material means you can fit it in most pack and larger vest pockets for a snug and secure fit. Topped with our SpeedFill™ Cap for quick refills.
Our Verdict
The Hydrapak UltraFlask Speed 500ml is built for easy access while moving, with a soft structure that sits securely in vest pockets and reduces movement as it empties. At 42g, it is light and compresses down to save space in your pack. The bite valve delivers a steady flow and seals cleanly, while the SpeedFill cap makes refilling quick and straightforward. The shape works best in compatible pockets, where it stays stable without shifting. It is a practical option for fast hiking or long days where accessibility and low bulk matter.
- Reviewed by Ultralight Outdoor Gear
Features
- Soft material conforms to most hydration packs and larger vest pockets for a secure and stable fit.
- Easy to drink bite valve auto-seals after each sip, eliminating annoying drips.
- Designed for fast filling - flips open for quick refills and snaps closed for leakproof transport.
- 42mm opening lets you fill the flask easily with ice and drink mixes.
- Flexible design shrinks as you drink, reducing water movement.
- Pair with 42mm threaded backcountry water filters including the HydraPak 42mm Filter Cap.
- Made of ultra-durable, abrasion resistant TPU & RF welded seams for superior durability and elasticity.
- Wide working temperature range (can be frozen - max temp 60° C / 140° F).
Specifications
- Weight: 42g
- Dimensions: 240 mm x 55 mm / 9.4 in x 2.2 in
- Capacity: 500ml
Material & Construction
- TPU, PP, Silicone, POM, 304SS
