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Specialized Little Big Mouth 21oz Water Bottle



Leak-free, taint-free bottle that'll stay put in your bottle cage

At every product is thoroughly tested for as long as it takes to get a proper insight into how well it works. Our reviewers are experienced cyclists that we trust to be objective. While we strive to ensure that opinions expressed are backed up by facts, reviews are by their nature an informed opinion, not a definitive verdict. We don't intentionally try to break anything (except locks) but we do try to look for weak points in any design. The overall score is not just an average of the other scores: it reflects both a product's function and value – with value determined by how a product compares with items of similar spec, quality, and price.

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The Little Big Mouth 21oz is Specialized's best-selling bottle apparently, and while it isn't exactly ground-breaking (what is in the hydration world?) there is a lot to like, especially the leak-free poppet top.

  • Pros: Spout is easy to use and doesn't leak sticky drinks on your frame
  • Cons: Doesn't come apart easily to clean

The main thing I hate about carrying drinks on the bike are bottles that dribble, but that isn't an issue here with the Little Big Mouth as it seals completely. Both the screw cap and what Specialized calls the poppet top keep all of the liquid inside until you want it.

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That poppet top is soft to the touch and is much nicer to pull up with your teeth than some of the hard plastic ones found on many other bottles. It also allows a decent flow of drink to pass through, although I'm not sure if the bottle has a whole allows a 50 per cent greater flow rate than other bottles on the market, as Specialized claims, in a side by side real world test.

The mouthpiece doesn't come apart for thorough cleaning, which might bother some people. The spout does come up quite high, though, so you can get in and around with a toothbrush for a quick clean up.

Specialized Little Big mouth 2nd Gen - cap.jpg

Another thing I like is the use of BPA-free plastic, which is made from 100% FDA food-grade materials, and Specialized also says that it is printed with non-solvent-based CPSC-approved ink and materials. This means there is nothing to taint the flavour of plain water or whatever liquid you have inside.

The printed pattern on this bottle is surprisingly robust – I thought it would start looking scratched after a few times of putting it in and out of the cage, but it has all remained intact, though the white body of the bottle has become a little scruffy, with light scratches retaining the dirt.

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As well as this design, it's available in a grey/blue/red colourway or translucent with the Specialized logo, and you can also get that setup in black with a white lid.

If this 21oz (approximately 600ml) isn't large enough, there is also the 24oz (around 710ml) Big Mouth version, which costs £8.50.

Even on price the Little Big Mouth  stacks up pretty well against the likes of Zefal's Sense Pro 65 bottle that John was impressed with, which costs 49p more, and the Skratch Labs CamelBak Podium, with an rrp of £7.95.

Overall, the Little Big Mouth delivers everything a bottle needs to really well. It's easy to fill up, easy to drink from, and doesn't leak.


Leak-free, taint-free bottle that'll stay put in your bottle cage test report

Make and model: Specialized Little Big Mouth 21oz Water Bottle

Size tested: 21oz

Tell us what the product is for and who it's aimed at. What do the manufacturers say about it? How does that compare to your own feelings about it?

Specialized says, "Our best-selling bottle, the Little Big Mouth 21oz Bottle takes a revolutionary design and shrinks it down a bit. It's conveniently shaped and absolutely leak-proof. It has a tight-sealing Big Mouth screw top that's ultra-wide for adding things like ice or your hydration powder of choice. This piece also provides an incredible level of water flow that's up to 50% greater than the competition. Meanwhile, we gave the bottle a flexible, ergonomic design that grips to cages and fits easily in the hand, while the bottle's construction is made from BPA-free plastic that's 100% FDA food-grade approved."

Tell us some more about the technical aspects of the product?

From Specialized:

Tight-sealing Big Mouth screw top is wide enough for ice cubes and powder drink mix. Wide water channel delivers 50% greater flow than other leading bottles. Plus, improved functional outside grip.

Large, soft reliable poppet top is easy to activate, delivers excellent flow, and seals tight. 100% Leak Free

Easy to grip, more flexible than original Little Big Mouth

Also available in 24oz Big Mouth option

BPA-free plastic made from 100% FDA food-grade materials and printed with non-solvent base (UV cured), CPSC-approved ink and materials

Rate the product for quality of construction:
Rate the product for performance:
Rate the product for durability:
Rate the product for weight (if applicable)
Rate the product for value:

Tell us how the product performed overall when used for its designed purpose

No leaks, which is key when it comes to a quality bottle.

Tell us what you particularly liked about the product

Soft spout is nice to drink from.

Tell us what you particularly disliked about the product

The spout doesn't come apart for cleaning.

How does the price compare to that of similar products in the market, including ones recently tested on

It's about the same price as similar size and easy to use bottles like the Zefal and Skratch I mention in the review.

Did you enjoy using the product? Yes

Would you consider buying the product? Yes

Would you recommend the product to a friend? Yes

Use this box to explain your overall score

It does everything you need a quality bottle to do, though it doesn't come apart for cleaning like some of its competitors.

Overall rating: 8/10

About the tester

Age: 41  Height: 180cm  Weight: 76kg

I usually ride: This month's test bike  My best bike is: B'Twin Ultra CF draped in the latest bling test components

I've been riding for: Over 20 years  I ride: Every day  I would class myself as: Expert

I regularly do the following types of riding: time trialling, commuting, club rides, sportives, fixed/singlespeed

As part of the tech team here at F-At Digital, senior product reviewer Stu spends the majority of his time writing in-depth reviews for, and ebiketips using the knowledge gained from testing over 1,500 pieces of kit (plus 100's of bikes) since starting out as a freelancer back in 2009. After first throwing his leg over a race bike back in 2000, Stu's ridden more than 170,000 miles on road, time-trial, track, and gravel bikes, and while he's put his racing days behind him, he still likes to smash the pedals rather than take things easy. With a background in design and engineering, he has an obsession with how things are developed and manufactured, has a borderline fetish for handbuilt metal frames and finds a rim braked road bike very aesthetically pleasing!

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