UltraFlask+ 500ml vs UltraFlask Speed 500ml: Which Wins?
By HydraPak | Performance Hydration Reservoirs, Soft Flasks ... | Published: 2026-10-23
Category: Comparisons
Compare the HydraPak UltraFlask+ 500ml with built-in filtration and the UltraFlask Speed 500ml with fast-refill cap. Find out which soft flask fits your trail or travel hydration needs.
Quick answer
Choose the UltraFlask+ 500ml if you need to drink safely from natural water sources without carrying extra gear. Pick the UltraFlask Speed 500ml when fast refills and a lighter, simpler flask matter more.
Filtration vs speed: the key trade-off
The UltraFlask+ 500ml integrates a screw-on filter that removes common waterborne bacteria, letting you fill directly from streams or taps and drink immediately. That adds a few grams and requires occasional filter replacement. The UltraFlask Speed 500ml skips filtration entirely, focusing on a lightweight build and the SpeedFill Cap for quick refills at aid stations or kitchen sinks. Your choice depends on whether you prioritize backcountry independence or pit-stop efficiency.
How to decide between the two
- When to choose UltraFlask+ 500ml: Select this flask if you frequently run or hike where water sources are streams, lakes, or unfamiliar taps. The built-in filter lets you drink safely without carrying a separate filter bottle or tablets.
- When to choose UltraFlask Speed 500ml: Choose this flask if most of your runs use treated water from aid stations, home, or public fountains. The SpeedFill Cap speeds up refills, and the lighter weight reduces fatigue on long efforts.
- Consider the filter maintenance: The UltraFlask+ filter has a limited lifespan and needs periodic replacement. If you rarely need filtration, the simpler Speed model saves ongoing cost and effort. Check the filter manufacturer’s recommended replacement schedule before committing to the Plus model.
Product facts at a glance
- UltraFlask™+ 500ml: The UltraFlask+ 500ml includes a screw-on filter that effectively removes common waterborne bacteria. You can drink directly from streams or untreated taps without separate purification gear, making it ideal for trail running, hiking, or travel in areas with questionable water quality.
UltraFlask™+ 500ml - UltraFlask™ Speed 500ml: The UltraFlask Speed 500ml features a SpeedFill Cap for quick refills and a wider form with a 3D welded bottom for stability. The cap lets you refill rapidly during races or long runs, and the stable shape fits snugly in vest pockets without bouncing.
UltraFlask™ Speed 500ml
Which flask fits you best?
Best for
- Trail runners and hikers who refill from natural water sources
- Travelers who want one-bottle hydration without extra purification gear
Not ideal for
- Runners who only refill at treated aid stations and want the lightest possible flask
- Anyone who prefers to use a separate, dedicated filter system
