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ULTRAFLASK SPEED 600ml Water Bottle

4.204545454545454 out of 5 stars
44 Reviews

Out of Stock

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Why We Like The ULTRAFLASK SPEED 600ml Water Bottle

Go big. The largest of our ultra-light series, the UltraFlask Speed 600 ml holds more so you can go the distance. Its soft material allows it to fit snugly in most vest pockets and it shrinks as you drink to minimize water movement. Topped with our newest SpeedFill cap feature that makes aid station refills a breeze.

TPU, silicone
0.6L (20oz)
high-flow bite
7.3 x 3.2 in
Claimed Weight
Manufacturer Warranty
limited lifetime

Overall Rating

4 based on 44 ratings

Review Summary

1 Stars - 4 reviews
2 Stars - 3 reviews
3 Stars - 2 reviews
4 Stars - 6 reviews
5 Stars - 29 reviews

Fits True To Size

Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.
Runs smallTrue to sizeRuns large

What do you think about this product?


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5 out of 5 stars

May 17, 2024

Great hydration gear

All work perfectly in my Black Diamond Distance 11 pack.


Originally reviewed on HyrdraPak LLC

5 out of 5 stars

April 29, 2024


Carried the water I needed then packed up nice and small


Originally reviewed on HyrdraPak LLC

3 out of 5 stars

March 10, 2024

Ultra flask

I've used it once or twice and have initial impressions
Size Bought:

Water tastes like chemicals. Tried freezing with lemon juice. Still tastes bad. Like the idea if I can get rid of the bad taste.

5 out of 5 stars

February 25, 2024

Works well

Fits well in my running vest and works as intended. Froze with some lemon water before first use and was able to get rid of the plastic taste!


Originally reviewed on HyrdraPak LLC

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