UltraFlask 550 Hybrid Bottle

Rated 5.00 out of 5 based on 5 customer ratings
(5 customer reviews)


UltrAspire introduces yet another milestone in hydration history! All the benefits of the sport bottle without the downsides and all the benefits of a soft flask without the usual problems such as taste and staining from carbohydrate drinks. The UltraFlask 550 Hybrid Bottle is a cross between a hard bottle and a soft flask. This bottle has a body shape that conforms to the place it’s kept for the ultimate comfort, access, carriage and squeeze-ability. High flow easy use push/pull valve makes it perfect on the go. Made in the USA.



UltrAspire introduces yet another milestone in hydration history! All the benefits of the sport bottle without the downsides and all the benefits of a soft flask without the usual problems such as taste and staining from carbohydrate drinks. This great feeling, easy stowing bottle is a hybrid between a hard bottle and a soft flask! The light weight super-squeezable UltraFlask™ stands alone, is fillable and easy to clean, has high flow and fast recharge, is soft, flat and stable against the body, is easily accessed and returned to a vest pocket even when empty, and its great for waist packs too! The UltraFlask 550 Hybrid Bottle is BPA free.

• Simple push/pull nozzle with high flow.
• Soft and comfortable against the body.
• Ultra squeezable with quick recharge.
• Food-grade LDPE and made in the USA.
• Custom printing option available.

Hand-wash. Due to the nature of this ultra-squeezable bottle, it is not recommended for dishwasher use.

Additional information

Weight N/A
Dimensions N/A

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Product Weight (lbs)

Product Dimension (inches) LxWxH

Fluid Capacity

550mL (18.6 fl. oz)

5 reviews for UltraFlask 550 Hybrid Bottle

  1. Rated 5 out of 5

    Mathieu Fortin (verified owner)

    I used two of these flasks with the Alpha 2.0 vest and it was a great combo. The shape is perfect to avoid putting pressure on the ribcage, and they are surprisingly flexible, so they aren’t hard against the body. Good job UltrAspire, your products got me through a tough 100 km race ! Many thanks !

  2. Rated 5 out of 5

    Jim Bosik (verified owner)

    Loving the UltraFlask 550 for the lightness and squeezability. Will be using it for a 50 miler and a hundy this summer. In terms of taking a good swig, can’t be beat. Only suggestion…would be great if it were a tiny bit narrower and taller, since it is not the easiest to get back in to my UD Jurek vest. With that small change it would sell like crazy. All in all, a great product. Thanks!

  3. Rated 5 out of 5


    DJ Crites

    UMMMM, Favorite Water Bottle to DATE!!
    For me one of the reasons for using UltrAspire is the construction of this bottle! I was not a fan of how the soft flask versions of other brands collapsed into the pockets and became a fight to get back out. This solved my issue with “trail fishing”.
    The usage of a hybrid bottle soft with a firm shape is amazing. I never have to worry about the bottle loosing shape. The shape of the bottle is very comfortable in general, ie non-traditional bottle shape. Super comfortable to use in all fashions.
    I have 7 of the bottles, albeit some came with other products but personally I like to have 1 or 2 extra bottles on hand for races incase one gets damaged.

    Only personal issue I had when I first purchased, due to habit from other bottle styles I bit the mouth piece and deformed it. And this end does not regain shape after doing so. I have experienced the best way to open and close currently to avoid another damaged end is to open and close by hand. I have since purchased back up caps to help replace any being damaged in the future.

    ::SIDE NOTE:: Buying extra bottle cap ends may be worth while in the long run, just in case UltrAspire discontinues these bottles. I had this happen to me before on another brand and did not want to re-buy the new bottle style. End up finding a discontinued waist belt system on REI and purchased it just for the extra two bottles because the lid cracked.

    All in All this is such a great design and by far my favorite flask/bottle since using vest/bottle systems back to 2012.

  4. Rated 5 out of 5


    This is an outstanding water bottle from UltrAspire! The shape of it makes it super comfortable when in my Momentum vest or my Fitted Race Belt. The material is unlike any other water bottle I’ve used in the past. It’s surprisingly soft, yet structurally sound! And when you combine the pliability of the bottle with the high flow, push/pull valve cap… watch out!! Proceed with caution because you will be hydrated in a hurry! Not that that is a bad thing. Overall, it’s a great bottle for all your endurance needs! Bonus: it fits nicely in the cargo pockets of my pants!

  5. Rated 5 out of 5

    Alexander Humenetskyj

    GET IT! I was a little skeptical of switching from my soft flasks to what looked like a hard flask bottle. However, the UltraFlask 550 hybrid bottle is a perfect combination of both soft and hard making it my new go to bottle. I was pleasantly surprised with this creation. Simple, comfortably soft yet sturdy, high flow like it should be. Well done.

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