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Flasks - advice please

Flasks - advice please

Postby FiferStu » Tue Nov 19, 2019 8:12 pm

Never before have I sought advice for something so basic and mundane as a flask!

What I'm looking for is a flask that really WILL keep water hot for 12 hours - up the hills.

A general-use flask, perhaps kept in a car on a long journey, will probably keep hot for 12hrs, but that's no good for the hillwalker at 2000 or 3000ft with significant wind chill.

So - can anyone offer some advice? Any experience to share of the cheap and not-so-cheap brands?

I wouldn't quite say that "money's no object", but obviously I'm willing to pay a bit more for something that really will do the job.

Thanks for any replies.
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Re: Flasks - advice please

Postby jmarkb » Tue Nov 19, 2019 9:04 pm

12 hours is a stretch for any flask, but you might find this review article useful: https://outdoorsmagic.com/article/best-thermos-flasks-reviewed/
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Re: Flasks - advice please

Postby Ian Johnston » Tue Nov 19, 2019 10:38 pm

Hi Stu, Primus flasks. Simply the best I've ever used, they'll keep water hot enough for a brew after 12 hours. Not cheap but very good.

Kind regards

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Re: Flasks - advice please

Postby LoveWalking » Wed Nov 20, 2019 12:26 am

I use Stanley flasks, still hot after 8 or 9 hours. Not sure about 12 hours as I haven't ever tried them after that length of time.
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Re: Flasks - advice please

Postby WalkWithWallace » Wed Nov 20, 2019 8:27 am

Primus or Thermos Ultimate! 12 hours is always a bit of a stretch regardless of the claims, particularly taking them up winter mountains.

Might be stating the obvious, but pre heat the flask with hot tap water, then empty and put your soup or tea etc in. Also don't leave the flask to the elements, put it away deep in your rucksack. I made a foil cosy for mine, definitely helps.
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Re: Flasks - advice please

Postby ScotFinn65 » Wed Nov 20, 2019 8:49 am

I bought this flask and heat retention v. lightweight us exceptional.

I can thoroughly recommend..

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Re: Flasks - advice please

Postby whiteburn » Wed Nov 20, 2019 12:04 pm

Which ever Flask you finally decide upon make sure you test it before using in earnest.
I'd experienced two branded flasks, with stunning reviews, 'fail' straight out of the box (e.g. luke warm water after 2 or 3 hrs) & had to return for a replacements (probably manufacturing defect).
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Re: Flasks - advice please

Postby Giant Stoneater » Wed Nov 20, 2019 12:07 pm

We have a Aladdin Adventure Flask made of stainless steel and holds 1ltr which is battered and bruised after 22 years use and still keeps liquid warm for 8hrs in winter,been everywhere and totally bombproof.
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Re: Flasks - advice please

Postby SuperMillie » Wed Nov 20, 2019 1:03 pm

I have the same flask as ScotFinn65

A cracking wee flask, would also highly recommend
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Re: Flasks - advice please

Postby weaselmaster » Thu Nov 21, 2019 4:01 pm

As others have said, the Thermos Ultimate 0.5l is a damn good flask - been using them for 6 years. For max performance fill up with boiling water for 5 mins to take any chill off (more of an issue in winter months) then empty out and fill up with your desired liquid. If unopened, you should still have reasonably hot water inside at 24 hours.

I recently got hold of the Thermos Food King food flask, which are quite good for taking stew or rice/curry or whatever up the hills for lunch, they'll keep food hot for 4-6 hours if pre-heated like above.
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Re: Flasks - advice please

Postby Kendonm » Thu Nov 21, 2019 10:58 pm

Zojirushi, almost too good.
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Re: Flasks - advice please

Postby maremalin » Fri Nov 22, 2019 10:48 am

Kendonm wrote:Zojirushi, almost too good.

i second that
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Re: Flasks - advice please

Postby Marty_JG » Sat Nov 23, 2019 1:31 am

The "Stanley Master" is good for 27 or more hours, one of the longest-lasting insulation flasks but heavy and pricey.

It's not for everyone, but I enjoy taking a brewkit with me.
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Re: Flasks - advice please

Postby FiferStu » Sun Nov 24, 2019 7:10 pm


Thanks for all your replies and suggestions - much appreciated.

Last weekend I was out and about and spotted the Stanley 1L flask, sold by Blacks Outdoors. I almost scoffed at their claim - that it kept water hot for up to 40 HOURS??!! There was no price on it, I just picked it up and the weight was quite something - around twice as heavy as your average flask (and that, of course, was empty. Add a litre of water and you've got a heavy flask indeed to add to the daypack). I declined.

Plenty of recommendations above - I will look at them all. Thanks again for your replies and comments, much appreciated.
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Re: Flasks - advice please

Postby Uncle bob » Sun Jan 26, 2020 7:18 pm

i can vouch for stanley flasks ....i've a 1.4 ltr, a 750 ml ....and a 700ml food flask.

the 1.4 ltr is the biggest and heaviest ....but this one keeps my drinks really hot the longest 24hrs is no problem for it .
The 750 , 12 - 15hrs max
The 700ml food flask , 8 - 12hrs max

i would say i have a good few years knowledge of using flasks......worked on the buildings all my working life ...been camping since i was a kid using cork stopper flasks.

but my advice is NEVER buy a flask with push button to pour stopper ....it leaches out the heat ....the stopper is the flasks weakest thermal point ...my 1.4 ltr has the smallest stopper compered to its insulated body thickness...the 750ml has the same size stopper but its body is less thick .....the reason the food flask is so poor heat retention wise, is the really wide stopper......(its a new purchase )....i hope to increase this with the glove in lid

if you want to improve your flask heat retention put a cheap poundland thermal glove in the cup/lid ..screw lid tight and try that.....hope this helps ...ive walked , winter camped....but not above 1,500 - 2000 ft .
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