What is the HydraPak UltraFlask Speed 500ml?
The HydraPak UltraFlask Speed 500ml is the ultimate hydration solution for trail runners, hikers, and fastpackers who need safe, efficient, and compact water access on the go. It fits snugly into most hydration vests and pack pockets. The flask's integrated SpeedFill Cap allows for quick refills at any water source, while its built-in hollow fibre filter delivers clean, safe hydration wherever your trail leads.
What is it made of?
The HydraPak UltraFlask Speed 500ml is constructed from a premium blend of TPU, Silicone, POM, Hollow Fibre, and ABS, providing an ideal balance of flexibility, strength, and long-term reliability.
TPU Body with RF-Welded Seams
The TPU (thermoplastic polyurethane) body provides a soft, flexible structure that conforms comfortably to your pack or vest pocket. Despite its pliable feel, it's highly resistant to punctures, abrasion, and stretching.
Its RF-welded seams create a completely watertight bond, eliminating weak points and ensuring leakproof durability through repeated use and compression.
Precision-Engineered Components
The Silicone mouthpiece delivers a smooth, food-grade drinking surface with a natural bite response for effortless hydration.
Meanwhile, POM and ABS structural elements reinforce the filter housing and cap threads, ensuring a secure, precise connection that can withstand high pressure and regular use.
Safe, Non-Toxic Construction
All materials are BPA- and PVC-free, ensuring that every sip tastes fresh and clean without chemical aftertaste. The construction is food-safe, environmentally conscious, and built for repeated, long-term use.
Designed for Durability and Flexibility
Engineered for demanding outdoor use, the UltraFlask is made to withstand thousands of fold-and-refill cycles. It retains its flexibility and form even under heavy compression, maintaining reliable performance through every adventure.
What are its features?
Fast and Safe Filtration
The integrated filter removes 99.999% of E. coli bacteria and 99.9999% of parasitic cysts, such as Cryptosporidium parvum and Giardia lamblia. It filters up to 1,500 litres of water at a rate of over 1L per minute, keeping you hydrated safely and efficiently in the wild.
Secure Grip
A flexible, structured grip section makes it easy to hold the flask while filling or attaching filters — even with wet or gloved hands.
Vest and Pack Compatibility
Designed to fit snugly into most hydration vests and pack pockets, the UltraFlask's soft material conforms to your gear for a stable, bounce-free fit that stays comfortable during intense activity.
High-Flow Bite Valve
The self-sealing silicone bite valve offers smooth, effortless hydration and automatically closes after each sip to prevent leaks or drips.
Wide Opening for Easy Filling
The 42mm SpeedFill opening allows you to refill quickly at streams, taps, or water stations — saving precious time on the trail.
Compressible & Space-Saving
As you drink, the flask shrinks to minimise water movement, reducing sloshing and saving pack space. Its collapsible design makes it easy to stash once empty.
Included Backflush Adapter
The included adapter connects to your HydraPak Stow or another clean water bottle for easy backflushing, helping to restore the filter's flow rate and extend its lifespan.
Features:
- Integrated filter removes 99.999% of E. coli and 99.9999% of parasitic cysts
- Filters up to 1,500L of water at >1L per minute
- Flexible grip for easy handling during filling or filtering
- Conforms to most hydration packs and vest pockets for a secure fit
- High-flow self-sealing bite valve prevents drips
- Wide 42mm SpeedFill opening for quick refills
- Compressible body reduces water movement and packs flat when empty
- Includes backflush adapter for restoring filter performance
- BPA- and PVC-free construction for safe, clean hydration