HydraPak UltraFlask Speed (500ml or 600ml) – Collapsible Soft Flask Water Bottle for Hydration Vests and Running Packs with Easy Open Cap
$ 45.00
Price: $20.00 - $45.00
(as of Mar 14, 2025 00:48:56 UTC – Details)
HYDRATION VEST COMPATIBLE: Fits easily in most hydration vests, belts or pack pockets. Provides bounce-free stability and a flexible flask shoulder to prevent chafing.
COLLAPSIBLE FLASK: Soft material conforms to any pocket, and shrinks as you drink to reduce movement and pack away easily when empty.
PERFECT FOR AID STATIONS: UltraFlasks are equipped with our SpeedFill Cap designed for quick and easy refilling at aid stations. A side tab pops open the cap in one motion and snaps shut with a click.
CUSTOMIZABLE CAP: Built for versatility, the UltraFlask comes with a 42mm customizable cap. Choose between straw or bite valve.
BEYOND LIFETIME WARRANTY: If you experience any issue, we’ll repair or replace the item for free. Whatever it takes to keep your adventure going.
Customers say
Customers appreciate the water bottle’s build quality, ease of cleaning, and hydration capacity. They find it well-made, easy to refill, and can put them in the dishwasher without worrying about left-over taste. Many consider it a great alternative to a water bladder and say it gets the job done. They are satisfied with the size. However, some customers have mixed opinions on leak resistance, fit, and plastic taste.
AI-generated from the text of customer reviews
13 reviews for HydraPak UltraFlask Speed (500ml or 600ml) – Collapsible Soft Flask Water Bottle for Hydration Vests and Running Packs with Easy Open Cap
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$ 45.00
Dustin M –
great product and great price
bought these to have extra bottles and longer stems to drink from. love how they collapse as you drink them. keeps the water slosh down to a minimum. easy to clean and use. would recommend
T.P. –
Really love these ultra flasks- adaptive
I am an ultra runner and have just started adding these soft flasks to my packs for longer runs to hold electrolytes or other liquid fuel so I can keep my water bladder with just water. I like how they collapse with use so you are left with a lightweight small footprint of a product. Super easy to refill with the hinged lid (SO much better than trying to fill a smaller spout area). I love that the mouthpieces are interchangeable. I really like the straw but my current running vest sits too high to use the straws and they keep bouncing into my jaw or side of my face, so I am just using the mouthpiece. They are easy to clean, have no odor or taste, and made of quality material. I highly recommend over others on the market
LShoe –
Perfect
Performed as expected. The product did not leak – easy to carry – it is collapsible – dries without issue – Con: slight plastic taste to water.
Anthony –
Great option but pricey
Hard to beat these for a 500mL option. Cap usually stays shut and is super nice for filling and adding things quickly. No durability questions with the price tag but still rather expensive compared to other options.
AmaZon_cUstOmeEr –
Great little bottle.
I use this for outdoor activity, where a full sized Camelbak would be inconvenient. I shoved this into a fanny pack recently during skiing. I noticed that the fanny pack got a little wet inside. I don’t know if the bottle weeps through the cap, or through the drink nozzle. The plastic taste went away after rinsing a couple of times with plain water. I have also learned not to fill this completely to the brim, as closing the lid will always lead to some of that liquid spilling out.
ben –
To the review that said it wasn’t collapsable.
I read a review that said it wasn’t as collapsible as it could be. I disagree. I’ll let the images speak for itself.Now to the product. Water bottle is fantastic and as advertised. Refer to the photos where I use my hand as a size guide. In comparison I would say it’s about the size of a crystal ice bottle drink but a little shorter (I got the 600ml)Very lightweight and great for concerts, backpacking, camping, hiking, running or other outdoor adventures.I kinda wish I got two .Only con I see, which is personal preference, is that the spout you drink from, has to be bitten, to drink. You cant really drink it from a squeeze in the air like a gatoraid commercial lol but doesn’t bother me.
Trusted Amazon User –
Ultramarathon Approved
Purchased these for use in a 40 mile trail ultra. I had no leaks and no issue during the entire event. I put them in my Salomon adv skin 12, they were a little tight fit just fine. I was able to bend the straw and use the retention straps on the skin 12 vest. If you do use them in a vest I found I the straws flapped if I didnt make sure the slightly firm oval tops of the bottles weren’t all the way down in my vest. As soon as I made sure to push them down so the firm top was below the elastic, they held firm and weren’t hitting me in the face. I found that screwing the tops off and on to not be as smooth as the flasks that came with my vest but I only unscrewed them when cleaning them so this really isn’t a complaint just an FYI. The pop top enclosures worked great for refueling during my race and gave me zero issues. I opted to go with the 600ml and I’m happy I did as it fits my vest without issue and provides 200ml extra between the two.
Courtney –
The bite valve cap comes off super easily, causing my fuel to spill everywhere mid marathon
The soft valve is made to be interchangeable with the straw. Which might seem like a feature at first, but it means that it’s very tenuously attached to the cap. I went to take my first sip from it at mile 18 and the cap just came right off, causing my fuel to start spilling EVERYWHERE. By the time I was able to fix it, I’d lost almost the entirely bottle onto me, which was pretty unfortunate. Do not recommend.
Manuel Steiner –
Ich nutze die Flasks bei Trailrunning Wettkämpfen, bei denen es an den Verpflegungsstellen schnell gehen muss. Durch den Clip-Verschluss fällt das auf und zu schrauben weg und ermöglicht dadurch ein deutlich schnelleres nachfüllen. Die Flasche hält dicht und läuft auch in einem Laufrucksack nicht aus. Die Flasks haben ähnliche MaÃe wie die Salomon Flasks und passen in alle Salomon Rucksäcke, andere Laufrucksäcke weià ich nicht genau.Natürlich ist die Flask nicht nur für schnelle/ambitionierte Läufer geeignet sondern auch für Leute die es gerne einfach haben. Jedoch würde ich schon sagen, dass der Hauptvorteil beim schnellen nachfüllen liegt.
jonathon knight –
I had an inov8 vest and somehow lost the part of the hydration pack that goes in your mouth. I think itâs called the bite. These are a perfect replacement and what inov8 uses. Only thing is they are a different colour and cost a lot if your just after the mouth piece
DC –
Use it in the shoulder pouches of an Atompacks 55 liter pack. Easy hydration on the move without having to pause to reach back for a bottle in a side pocket, which ensures constant and consistent replenishing of fluids. Large opening works well for pouring electrolyte powders. Simple to refill with a BeFree water filter. Recommend for simplicity on the trail.
Christine Gomes –
Os flasks são de muito boa qualidade. Já os usei em treino e competição. A abertura rápida dá jeito para abastecimentos e agora uso sempre os extensores porque me dá mais jeito.
Nätti –
Tolles praktisches Produkt. Riecht nicht, ist kompakt, gut zu reinigen, schnelle Lieferung. PerfektVielen Dank