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Biologic Vacuum Flask



If you want to take a hot drink on your bike, this flask will do the job just fine

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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Biologic is Dahon's component and accessory arm, and they're currently busy growing their range of commuter friendly offerings. This Vacuum flask is designed to sit in a bottle cage and be operable with one hand, so you can enjoy your coffee on the way to work.

The flask is a two-part affair with a stainless double-skinned vacuum container topped with a plastic lid with a sip spout. Sorry, SipSpout™. Opening and closing the spout is achieved by pressing the big clicky button on the lid. Fill it up with piping hot coffee and the flask performs about as well as you'd expect a stainless flask to; you'll get a good few hours of grace before everything gets a bit tepid. It's a snug fit in most bottle cages we tried, though its weight when full means it's a bit unruly in the lighter Carbon offerings.

All in all it does everything it's asked to without fuss. The only minor niggle is that the spout is a bit of a faff to clean and won't allow you to enjoy your chunky vegetable soup unless you stop and unscrew the lid. But as a way of transporting hot (or cold) beverages by bike it's a tidy solution. Good for commuting, also good for those freezing winter training rides where you *really* need a coffee an hour in...


If you want to take a hot drink on your bike, this flask will do the job just fine.

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Make and model: Biologic Vacuum Flask

Size tested: n/a

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?

* The only vacuum-insulated, bottle cage compatible, one hand operable, bottle on the market

* Compatible with standard bicycle bottle cages and the BioLogic QuickMount Bottle Cage

* Surgical grade 304 stainless steel is durable, BPA free, and won’t impart taste

* SipSpout top designed especially for hot coffee or tea

* 375 ml (12.7 fl oz) volume capacity

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Did you enjoy using the product? Yes

Would you consider buying the product? Yes

Would you recommend the product to a friend? Yes

Overall rating: 7/10

About the tester

Age: 38  Height: 190cm  Weight: 98kg

I usually ride: whatever I'm testing...  My best bike is: Genesis Equilibrium with SRAM Apex

I've been riding for: 10-20 years  I ride: Every day  I would class myself as: Experienced

I regularly do the following types of riding: time trialling, cyclo cross, commuting, sportives, general fitness riding, fixed/singlespeed, mtb, Mountain Bike Bog Snorkelling, track

Dave is a founding father of, having previously worked on Cycling Plus and What Mountain Bike magazines back in the day. He also writes about e-bikes for our sister publication ebiketips. He's won three mountain bike bog snorkelling World Championships, and races at the back of the third cats.

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