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ULTRAFLASK SPEED 500ml Water Bottle

4.195121951219512 out of 5 stars
41 Reviews
Color:Malibu Blue



Why We Like The ULTRAFLASK SPEED 500ml Water Bottle

Part of our ultra-light series, the 500 ml is so light, you might forget you brought it. Weighing in at just over an ounce, its optimal hydration, no matter what kind of runner you are. Its pliable material conforms to most pockets, it shrinks as you drink to minimize water movement and it can be used with or without the tube. Topped with a new feature, the SpeedFill cap, makes aid station refills a breeze. Ultra light weight, ultra useful.

TPU, silicone
0.5L (17oz)
high flow bite valve
7.3 x 2.3in
Claimed Weight
Manufacturer Warranty
limited lifetime

Overall Rating

4 based on 41 ratings

Review Summary

1 Stars - 4 reviews
2 Stars - 3 reviews
3 Stars - 1 reviews
4 Stars - 6 reviews
5 Stars - 27 reviews

What do you think about this product?


Selecting an option will reload the available reviews on the page
5 out of 5 stars

January 29, 2024

Flip tops are an excellent upgrade!!!

I had the previous model of this (w/o the flip top) and was happy with it. Now, having the flip top is a game changer! Such an excellent upgrade. I recently did a 30K and ran with 2 of these in my vest. It was so convenient to flip open the top to refill versus having to unscrew and screw back on because sometimes it was hard to screw back on especially when you're trying to leave an AS. Love the new model!

Gen J.

Originally reviewed on HyrdraPak LLC

5 out of 5 stars

October 2, 2023

Extra Hydration from an Awesome bottle

Love this bottle, the extra 100ml makes a difference and it fits fine in Salmon and Nathan vest. The oval shape makes it easier to grip when taking off the lid vs the round bottles. We have used this bottle on both 50K and 50 milers with no problems.


Originally reviewed on HyrdraPak LLC

4 out of 5 stars

September 22, 2023

My favorite hiking gear

I love having the speedflask in my shoylder water pocket while hiking and backpacking. I use it for flavors and electrolytes and the bite valve means I drink more often. I do wish it came in a 1-liter option that fit in a backpacking shoulder pocket.


Originally reviewed on HyrdraPak LLC

5 out of 5 stars

September 1, 2023

Best bite valve ever!

I am impressed with the UltraFlask Speed 500ml. It has the best self closing easy sipping bite valve! Also it truly is compatible with my "Be Free" water filter.


Originally reviewed on HyrdraPak LLC

4 out of 5 stars

August 26, 2023

Great product but awful initial taste

The plastic taste is initially pretty terrible, hence the 4 stars. I spent a couple of days soaking them with baking soda water and rinsing them out with a dilute vinegar solution, which helped tremendously. I would love it if Hydrapak could fix the taste before shipping these products! Once the taste was tolerable, I liked these bottles a lot. They fit perfectly in the taller chest pockets of my BD distance 8 vest. The tube is a good length for me to use, but would fit the BD pack a little better if it were like a half inch longer. The flip cap feature works better than I expected and holds watertight, but I won’t be surprised if they start to fail in a few years. Overall recommend, but make sure to give yourself a few days to clean them out before you use them!


Originally reviewed on HyrdraPak LLC

2 out of 5 stars

May 31, 2023

Bad chemical taste

The bottles work very nicely, and the flip cap and extension hoses work nicely as well. However, the bottles impart a terrible chemical taste to the water content; I hoped this was temporary and tried to rinse, clean, and"soak" the bottles in water to get rid of the taste, but it doesn't work. I've left the bottles filled with water for 6-8 hours at a time for probably 20 times so far. The taste has lessened a bit from the first sip that left my tongue feeling "odd", but the bottles still impart the chemical taste to the water within minutes of filling them.


Originally reviewed on HyrdraPak LLC

1 out of 5 stars

May 22, 2023

Good product made bad

I have the Salewa Transflow, which based on the first generation of the SoftFlask. I love this Flask, so i wanted to buy another. This new Version of the SoftFlask is a big downgrade. The weight is higher, the cap is bigger, i don't understand why they change it


Originally reviewed on HyrdraPak LLC

5 out of 5 stars

February 28, 2023

Cool product

Cool product. Will defiantly purchase more. I wish the smaller bottles were in stock. These are great but was hoping for something smaller for my kiddos.


Originally reviewed on HyrdraPak LLC

5 out of 5 stars

January 24, 2023

Perfect for hydrating on long runs

Wonderful hydration packs. Highly recommend these long straws as it makes it so easy to drink while running and not have to mess with my pack. Opens easily so you don’t have to unscrew the lid. No leaking at all. Used them on a 10 mile and a 6.5 mile trail run so far and they have been wonderful


Originally reviewed on HyrdraPak LLC

5 out of 5 stars

December 24, 2022

Ultraflask speed

Love them! So easy to fill and collapse as the empty for no sloshing

Jeri Rose

Originally reviewed on HyrdraPak LLC