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Hydration and Nutrition / Nutrition / Gels
GU Flask (Holds 5 Servings) GU Flask
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Flask (Holds 5 Servings)

Mfg PartNum:124119
  (9 customer reviews)
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Fuel efficient.

GU's flavorful ride gels are incredibly convenient and delicious in themselves, but we've all experienced how troublesome they can be to open, extract, and stow away. Well no more sticky hands and littering with GU's redesigned flask, created in collaboration with the experts at Hydrapak. Its soft design takes less effort to get the gel where you want it, helped along by the high-flow nozzle that's also less messy than traditional designs. It even features printed hash marks so you can measure out your nutrition over the course of your ride.

Holds 5 servings.

B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.


Mfg PartNum: 124119 

Ordered by Most Relevant First
5 stars
4 stars
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1 stars
great concept, or so it first seems. But, alas, it appears impossible that ANYONE will figure out how to keep the fingers from getting sticky.
by Supai Joe
3 of 4 customers found this review helpful.

Other than the hard-to-loosen nozzle, the other serious downside is if you don't work thru the batch in your flask relatively fast, then the gel hardens in the flask corners and along the bottom edge. Short window to work through 5 packs' worth. So back to the individual eco-insensitive packs I go ,)

Reviewed 1/5/2017
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Okay but not great
by Connie

I use this on long runs. I usually only put two GUs in it. Unless I thin it a bit with water I have a hard time getting it out. Even then, its still hard to squeeze all the air out from the bottom to get all the GU, while running. I also dont care for the hard plastic nozzle. I feel like Im going to break my teeth when running and jamming it in my mouth. I wanted to love it since there arent many alternatives, but I just dont. At least it wasnt very expensive.

Reviewed 4/16/2020
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Best Flask in the Business
by Long Rider
Cycling Enthusiast
Victorville, CA

This beats the GU flask in every imaginable way. First, it has a bigger mouth, so it's easier to load, 2nd, it's soft. Really, really soft, and pliable. Not only will it not leave you with a spinal injury if you take a fall, but you can twist & wring it to get ALL of the ride fuel out of it. It's also very easy to clean, in part because of the pliable (silicone?) flask material, but also because of it's pliability, and large mouth.

Best of all though is the valve can be twisted open & closed by holding it between your teeth while squeezing, so on timed events you don't have to stop to feed. With Powerbars no longer in production, a reusable system is more important than ever. This makes the gel system workable enough you won't mind leaving bars behind.

Reviewed 2/18/2020
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Good size and texture cap can screw loose
by Uncle Late Nite

A nice option to other flasks, well made and easy to squeeze everything out. Only complaint is the cap screws off to open valve, so you gotta pay attention. I have another with a bite valve that solves this issue, still a good product.

Reviewed 5/3/2019
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Poor flow (using GU roctane) in cold conditions
by Anonymous
Cycling Enthusiast

Purchased for gravel riding (to minimize waste and optimize gel use) but nozzle flow required concentrated pressure which distracted from riding and did not provide adequate quantity. Flow was negligible when temps were 45 deg or lower using GU roctane.

Reviewed 12/19/2018
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Love this product
by fogmaster
Cycling Enthusiast
Half Moon Bay, CA

I love this dispenser, it is a little hard to clean out but it the best way to dispense your Gel. Buying the Gel by the larger container vs. the packets is really good way to save packaging, pay less for the gel and not cut your mouth on those metallic packets. Plus you can swallow a little or swallow alot and no messy packet to deal with later.

Reviewed 7/19/2018
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Good not Great
by kevin
Cycling Enthusiast
Dallas, TX
0 of 1 customers found this review helpful.

Have used several times on my training rides. I make my own GU. Issue for me is that it is not easy to use one-handed. Taking two hands presents some additional risks while cycling. Furthermore a few times the entire top rotated, vs just the spout. Thus I will continue to use on training rides but in other rides will likely continue to use the packets that I can open with my teeth.

Reviewed 4/9/2018
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Invaluable Product
by Anonymous
Cycling Enthusiast
Phoenix AZ
1 of 1 customers found this review helpful.

Bought 2 of these to use for easier nutrition consumption. A great decision with no mess or trash to worry about during extending rides.

Reviewed 1/11/2018
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Hard to open
by MikeMo
East Tennessee

Be careful and don't over tighten! Extremely hard to get open to fill if cap is too tight. Otherwise a very good product. Very pliable and easy to squeeze. Has doseage marks. I like it better than the Hammer flask.

Reviewed 5/2/2017
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