Brand: HydraPak
Category: Running Bottles, Flasks & Cups
Recommended by Michael Whitfield, Trail Runner — Goldsboro, NC
The UltraFlask™ Speed 500ml 2-Pack is designed for athletes seeking a lightweight and efficient hydration solution. With its innovative design and user-friendly features, this soft flask ensures you stay hydrated during your most intense activities. 1. Lightweight TPU material provides flexibility and durability for long-lasting use. 2. 500ml (17oz) capacity strikes the perfect balance between hydration and portability. 3. SpeedFill™ Cap allows for rapid refills, minimizing downtime during your run or hike. 4. Wider form and 3D welded bottom enhance stability and prevent tipping during movement. 5. Compact design fits seamlessly into most running packs and vests for a secure carry. 6. Packs down easily when empty, making it convenient for storage and transport. 7. Ideal for trail running, hiking, and other outdoor activities where hydration is essential. The UltraFlask™ Speed 500ml 2-Pack is perfect for runners, hikers, and outdoor enthusiasts who require quick access to hydration. It excels in dynamic environments such as trails and parks, where lightweight and compact gear is crucial. Ideal for both casual joggers and serious athletes, this flask is designed to perform in various weather conditions, ensuring you stay refreshed on your adventures.
Price: $42
- Who it's for
- Trail runners and ultramarathon racers who carry water in vest pockets, especially those doing long efforts like 100-milers. Also suits backcountry users who pair soft flasks with a filter cap for lightweight water management.
- What people are saying
- Hosts consistently praise the minimal slosh, easy refilling, and vest-pocket fit; the snap/Speedfill cap gets specific credit for on-the-go drinking. One host recommends sizing up to the 600ml for longer mountain runs, suggesting 500ml can feel limiting.
- Worth noting
- The Speedfill cap can come undone when stored inside a pack without the filter top — worth monitoring. Works with filter caps for backcountry use.
Michael Whitfield's review
Paired with the long straw
Recommended by Michael Whitfield, Trail Runner
Frequently asked questions
Who is the UltraFlask™ Speed 500ml 2-Pack for?
Trail runners and ultramarathon racers who carry water in vest pockets, especially those doing long efforts like 100-milers. Also suits backcountry users who pair soft flasks with a filter cap for lightweight water management.
What do experts say about the UltraFlask™ Speed 500ml 2-Pack?
Hosts consistently praise the minimal slosh, easy refilling, and vest-pocket fit; the snap/Speedfill cap gets specific credit for on-the-go drinking. One host recommends sizing up to the 600ml for longer mountain runs, suggesting 500ml can feel limiting.
What should you know before buying the UltraFlask™ Speed 500ml 2-Pack?
The Speedfill cap can come undone when stored inside a pack without the filter top — worth monitoring. Works with filter caps for backcountry use.
What does Michael Whitfield say about the UltraFlask™ Speed 500ml 2-Pack?
Paired with the long straw
Why does Michael Whitfield recommend HydraPak?
Michael Whitfield recommends the HydraPak UltraFlask™ Speed 500ml 2-Pack for running bottles, flasks & cups. Paired with the long straw
Is the UltraFlask™ Speed 500ml 2-Pack a good running bottles, flasks & cup?
Yes — Michael Whitfield recommends the UltraFlask™ Speed 500ml 2-Pack by HydraPak as their running bottles, flasks & cups pick. Paired with the long straw
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What other hosts are saying
8 experts recommend the HydraPak UltraFlask™ Speed 500ml 2-Pack.
So many flasks, so much water!
Recommended in Cocodona 250
I usually put my filter top on this 500 ml soft flask. With good planning and a filter, I am usually fine with 1 L total water capacity on most of my trips (two 500ml soft flasks). One thing to be mindful of if you are not using the filter cap and are storing this in your pack is that the Speedfill cap can come undone!
Recommended in Fastpacking
Ben Corwin, Hutkeeper and mountain adventurer
Easy to fill and designed to fit a wide variety of pockets, we use these flasks for water and electrolyte drinks alike on long runs. Generally carry two, both up front, but sometimes one is enough if it's not too hot as there is quite a bit of available water on the Leadville 100 course.
Recommended in Teton Crest in a Day
I rec getting the 600ml for longer runs in the mountains
Recommended in Twisted Fork 68km
Best soft water bottles for carrying on the trails
Recommended in 10 Products I Actually Use
I use these bottles for every run, race, and adventure! They limit the "slosh" feeling and don't bounce around. The snap bottle really helps with easy re-fueling.
Recommended in 10 Products I Actually Use
the best soft flasks in the game. aid station volunteers are blown away when i roll up with these bad boys
Recommended in Pinhoti 100!
