Thermos Stainless King Flask, Midnight Blue, 1.2 L, 183267
What Matters to Us
For over 115 years, Thermos has been the trusted brand for quality insulated vacuumware products, keeping your drinks hotter for longer. Environmentally conscious, high-tech drinkware has never been more in demand than it is today and Thermos have something for everyone.
Technology Matters: Thermos Vacuum Insulation Technology Keeps Hot Things Hot And Cold Things Cold
| | | |
|---|---|---|
| With traditional containers, heat or cold finds its way inside through the process of convection. | Thermos vacuum insulation creates an airless space between two walls, virtually eliminating the convection process and temperature change. | Your drink will stay icy cold or steamy hot no matter what the forecast. |
Quality Matters
Thermos carefully chooses high quality materials and makes products with consistent quality and reliable performance. This ensures the highest quality of the products by testing for quality throughout the entire manufacturing process.
Living Green Matters
Thermos created the original reusable bottle and they have been green for over 115 years. They are continuously developing products that provide people on the go with more sustainable choices. By selecting a reusable thermos brand product you can help reduce the amount of waste sent to landfills while enjoying the high performance of the products available.
Safety Matters
Thermos products comply with applicable government and industry standards to ensure that the products are safe. All thermos insulated products are tested to meet en 12546-1:2000. Thermos factories are subject to third party audits on an annual basis to ensure a compliant environment.
Quality Matters
Living Green Matters
Safety Matters
| Weight: | 650 g |
| Dimensions: | 33.66 x 11.99 x 11 cm; 650 Grams |
| Brand: | Thermos |
| Model: | 183267 |
| Colour: | Midnight Blue |
| Colour: | Midnight Blue |
Reduce Kettle Use
Replaced the shattered inner glass thermo, safe and durable stainless steel that keep hot water hot overnight. Very please.
Fantastic
Fantastic product, slightly more expensive than others but you get what you pay for. My husbands coffee was still boiling hot after 12 hours
Keeps things hot for ages!
Great flask. Lovely colour and most importantly keeps drinks hot for ages. Made a flask of tea and upon emptying the flask the next day, more than 24-hours since making the tea, it was still steaming hot!
Hot water definitely stays hot!
I purchased the 1950’s green flask which I really like. I, also, don’t like the rattling handle so I’ve put an elastic band around the flask to hold it in place. But the water absolutely does stay hot. I boil a kettle first thing, have my cup of tea and pour the rest in the flask. My afternoon coffee water is still boiling.
Amazing best flask I've ever owned
Absolutely great product definitely does what it says on the tin. I’ve used many flask and towards the end of the day it’s normally getting cold/warm. Yet unlike other flasks I’ve owned I can still enjoy a hot coffee when I’m getting the train home after a 10hour day. Definitely would recommend to anyone tired of having cold coffee after a few hours. 5 stars dosent give it justice
All day hotness
My wife loves this flask and said it stays hot all day long.
Quality
It keeps the temperature for a long time, easy to clean, I recommend it very well
Great electric saver!!
With electric prices going through roof I bought this as gift.I’ve similar one and I’m on own all day .full kettle fills in morning and I leave beside it.never realised how many times I put kettle on during day for wee cups of tea until I go to get tea now. So it’s definitely saving electric.hope this one does the same for my friend.
Keeps water nice and hot for over 12 hours.
I bought it for keeping hot water ready for making infant milk. It is the perfect size and keeps the water nice for a very long time. It fulfilled its purpose so I’m happy.
It keeps hot drinks ho
Love the colour.
Love the size.
Love the heat,
That’s no surprise.
My hot stays hot.
My cold stays cold.
It’s easy to wash
So it doesn’t grow mould.
It’s got a groovy handle
So I can carry it.
I love it so much
I’m gonna marry it!
Keeps my brews hot !
Nothing else to say it’s a thermos, works great. A lot better than cheaper alternatives. Recommended.
Great value flask
Does what is says on the tin and very easy to use whilst holding heat for a long time.
Brilliant flask
Flask keeps hot drinks very hot for hours. I haven’t tried it with cold drinks yet.
Opened and emptied flask 24 hours after making and the drink was still very warm.
Best flask I’ve had for a long time!
Wish I’d got one soone
I now boil my kettle just twice a day, saving energy. A full flask with give me 4 mugs of tea/coffee It stays hot for 24 hours as it says it does. Love i
Excelle
I fill this thermos flask up at 5.30 am & its still hot at 5.30pm ,& i do mean hot not tepid but hot….absolutely excellent.
I bought this flask as, since the prices went up for living, I wanted to make the most of the electricity I used at home. Whenever I boil water in the kettle I now pour the remaining water inside this flask and indeed keeps the water hot for a long time! More than the usual flask you find nowadays. It is a bit pricey for me but in exchange for having something well made and that does the job it claims to do, I am happy with the purchase and would definitely recommend!
Excellent Value for money-BUT...Opening can be a Challenge
Excellent product and performs well.
Opening can be a challenge for people who have physical limitation with their hands, for example- people with arthritis or poor finger grasp and strength.
Great volume for several drinks, easy to carry and solid quality build
Hubs thinks this flask is great loads of capacity for coffee! Easy to clean shove in dishwasher robust construction reassuringly well designed unlikely to leak on days out. particularly like the articulated handle making it comfortable to carry.
Nice flask
Very good flask. One of the best I have ever had. We are Argentinians living in the UK and we love drinking mate. We fill this flask at night and it’s still hot enough for mate the next day around 11am.
Leakproof, large and pretty!
This is an excellent, robust flask, in a lovely colour (raspberry). It keeps coffee hot for at least 10 hours, I’ve found, even in winter. I particularly like the twist and pour top – no complex mechanism to go wrong. Large capacity so I can have hot coffee all day.
Ho
Really does keep liquids very hot for as long as it says. Even when left for hours and opened several times. I’ve had it up and down mountains. The smaller food flask is good too but not as hot as this
Looks Great Needs a Cup Handle
Flask looks amazing and will keep drinks hot literally 24 hours and beyond. Downside is the cup has no handle and is hot in your hands. I dropped it and burnt my leg quite badly unfortunately. So an improvement would be a handle on the flasks cup. Think mug not cup!
Best flask available
Love these flasks this is the second one I have and I take them away with me on fishing trips or during awaydays doing on site training.
Keeps brew very hot and my own personal opinion is that they are the best available. Also dedicated website for spares if needed.
Far better than my old steel flasks.
excellent buy good for hot and cold
I have to use a teas made, by my bed. So have my flask of milk bought upstairs for my use.
Very handy, also for hot drinks. Also easy to carry when I use my stair lift .
Mrs D Baylis
Doesn't leak!!!
Not cheap, but it is worth the money. I have had many flasks over the years, but this is the best, but most expensive I have owned. Really pleased with it. Doesn’t leak at all, which is great, and also it actually does keep my last coffee (which I like late afternoon) quite hot, and not luke warm or tepid, like my old flasks. Would I buy again? Most definitely!
Really good. Could be better!
Really good flask. Well made and keeps liquids hot for many hours. The cup could be a little better as it can get hot in use. A handle on the cup would be nice.
Thermos flask
Decided to try the stainless steel thermos flask. Very sturdy,easy to clean, good handle for big hands too. Stays hot for a good 24 hrs. Sturdy screw in stopper with cut out channel for easy pouring. I use mine every night taking hot water to bed with me and also when I was ill….
The only thing I don’t like is the metal connections for the handle is noisey at night……
Keeps coffee hot all day!
Perfect flask for my road trip and kept my coffee piping hot all day! Only downfall and why I’ve given it 4 stars is that the cup itself gets really hot as metal and not coated in what the flask is coated in so hard to hold the cup to drink it when it first comes out as so hot. Needs a handle or to be coated or not metal on the outside.
Great flask
A really good flask, keeps drinks hot or cold for a really long time (we’re talking more than 24 hours).
When it comes to the size it is a bit too big for my regular solo hikes, but it’s perfect for when it’s an all day walk or I’m with a friend or two.
The handle rattles a little bit when walking if the thermos is not tightly secured in a backpack, so I was thinking about taking it off. However, it’s proven useful when trying to pour some tea at the top on a mountain with tired and cold hands, so will be keeping it. May wrap something around it to keep it quieter though.
Overall – really, really happy with the purchase.
Does what it says and its easy to clea
This is more than a product. Is a childhood memory. I thermos labels with hot chocholates on camping trips and the refreshing water from the tap of out “thermos” during hot beach days. In all these years thermos has always kept its promises and exceeded expectations. I had other steel flasks rusting and rotting inside if liquid was forgotten in it. After months of using this and the 500ml i use for coffee and cream. Never anything stuck on the botto. Or in the rims. Finally l can take any liquid included hot broth, and it stays hot for the day. Peace of mind. Worth every penny.
Good quality
Bought this to replace an ageing Asdas own brand flask, went for one that was rated highly. First off, the colour of the cranberry red one I bought is lovely, nice deep finish. It keeps my water hot throughout the day and is still warm 24 hrs later. The lid is a simple one that you unscrew so far and pour the liquid, no complicated push buttons etc. Overall, good quality and value for money, recommended
Is there such a thing as TOO hot?
I bought the red Thermos. Can’t be bothered to run up and down getting coffee all day while working from home. This was pricier than other flasks I looked at but assumed it was just the name….nope! Ok, first, love the colour, just dry the outside to prevent water streaks when washing to maintain the shine. Was not happy with the handle, it sits flat against the flask and the metal buckles rattling against the metal sides give me unpleasant flashbacks to camping BUT turns out it is a plus. I can carry a dangling full flask comfortably with two fingers whick leaves another finger for the mug and thumb and forefinger for my water. Noore complaints about the handle!
The lid….I drink out of a mug, but at the end of the day, there is a little coffee left, that goes into the cup lid. A bit thick but it holds a good amount and would be good for those stopping for a break on a hike
Heat retention….. Over the top! I expected may be 5 hours as this was a Thermos bit again… nope….TEN hours and the coffee is still piping hot! I only pour half a cup at a time so I open it a lot during the day. My last cup of the day is still too hot to drink immediately.
Negatives. ..I am using this just for coffee and the metal rim at the top of the flask has a stain now. Needs metal wire to clean. Need to bleach it if I was to use it for tea or for anything cold as coffee is pervasive and needs at lots of soap and water to remove the smell of coffee.
Recommended this product, very pleased with it.
Does what it says on the flask
Stays really hot all day this is the best flask I’ve ever had would highly recommend i
Keeps things warm for hours
Use for carrying hot water and hot soup and keeps things warm for hours. Sturdy and great product. Would definitely recommend.
Worth paying the prices my work colleague loved i
I had one and my work colleague spends loads of money on drive-thru coffee now he takes coffee with him and loves how hot it still is at the end of the day even in this cold weather, little tip I put hot water in the night before then In the morning just put it in the kettle reboil it then put it back in and fro 6am till 9pm it still comes out as hot as it you just boiled it in the kettle
Does the job
Keeps the hit sell, which is the most important.
Not giving 5 stars cause the handle is too loose for my taste( not that is broken, it is meant to be like that)
It’s a thermos flask
I bought this as a cheaper, less hassle, coffee machine so I could have my usual 2 cups before I get up for work. So far, so good!
Rough and ready
Great flask keeps things hot for a long time ,I work in construction and this flask comes with me everywhere takes all sorts of knocks and is still in greatcondition love i
24 hours hot holds
One of the best tharmas ever I bought. Hot keep 24hrs is no a joke. It is very good to use i
Sturdy well-made looks rather cute too ❤️
I have purchased many flasks over the year and never lived up to the reviews, if I’m honest I was drawn to the great colour range ( sad but true )
It was slightly larger than I was expecting but not overly big . Very well make sturdy and easy to clean.
So does it do what it’s says on the tin
The answer is yes is the best flask I’ve ever invested in well worth the money . Cup a tad on the small side ( my only slight grumble) However I will be purchasing another one for my mother as she can have a pipping hot brew all day long by her bedside . So five stars form me .
Great purchase.
Fantastic price point on this flask.
Husband got smaller one last year so went for the larger one this time for picnics etc.
keeps drinks hot for almost full day.
Great.
Thermos flask
I bought this flask to replace an unbranded one i bought elsewhere . The thermos name is tried and tested it is a good flask and keep hot drinks hot for up to 24 hours .i recommend this flask and the Thermos brand to anyone who needs a flask.
Great value
Got this at a great price, bought for a Christmas present and the recipient loves i
Keeps water hot for many many hours
Purchased to store boiling water for on-the-move baby bottles. Easy to open and close, relatively lightweight (although pretty bulky, but was expected) and keeps water straight from the kettle extremely hot.
We first used when out of the house for 12 hours. This did many 4oz bottles, and still had water left. Was still very hot when I emptied the remnants after 12 hours. Would recommend for any usage.
King flask
Really pleased with this and yes it keeps the water piping hot for 24 hours
Boiling hot wate
This is a fabulous flask, I preheat it with boiling water at 6am, then fill with boiling water. It is still boiling at all my breaks at work on a being site at 10am, 1pm and 3pm. I also knocked it off the scaffold and it fell about 15 foot, although slightly dented it still works perfectly. Best flask I’ve ever bough
Boiling hot wate
This is a fabulous flask, I preheat it with boiling water at 6am, then fill with boiling water. It is still boiling at all my breaks at work on a being site at 10am, 1pm and 3pm. I also knocked it off the scaffold and it fell about 15 foot, although slightly dented it still works perfectly. Best flask I’ve ever bough
hot or cold
As described. good delivery. Does what it says. stays hot longer than 24 hours. Excellent product.
very impressed with it.
Definitely for travel only
A great size, it’s handle makes a bit of a racket but it’s a great brand and I can’t really comment much more since my dad is yet to use it.
Con: it came with little dent and packaging wasn’t great – came in an envelope so I’m guessing it got the dent that way.
Hot coffee, lovely
This an excellent flask and it does the job it designed for. What more can you ask for.
Highly recommend
It dose exactly what it says on package keep it hot for 24hours this is also very strong mine has had knocks around and still strong
Great performance
I use to store hot water for making tea. Once filled, it keeps the water hot enough to brew tea with 12hrs later so I’m more than happy. As should be expected, once opened and some water removed (and air allowed inside!) the temperature does start to fall, but is still warm enough to use another few hours late
Keeps drunk hot all day and doesn’t leak
This flask does what it says on the label.
It keeps a drink hot for 24 hours.
It doesn’t leak if carried on it’s side.
A solid item which does what it should.
Keeps drunk hot all day and doesn’t leak
This flask does what it says on the label.
It keeps a drink hot for 24 hours.
It doesn’t leak if carried on it’s side.
A solid item which does what it should.
Fab flask
This was bought as a present for my son in law ! He was really pleased with it. Just the right size for him and he liked that it had a handle to carry it.
Fab flask
This was bought as a present for my son in law ! He was really pleased with it. Just the right size for him and he liked that it had a handle to carry it.
Excelle
Very chuffed with this purchase. Keeps my tea boiling hot! I make my tea just before I go to bed at anot 9pm, I get to work for 6.30am amd the tea is like I have just boiled the kettle. I was really surprised by it as my other thermo flask was not as good as this. Definitely 5*
Excelle
Very chuffed with this purchase. Keeps my tea boiling hot! I make my tea just before I go to bed at anot 9pm, I get to work for 6.30am amd the tea is like I have just boiled the kettle. I was really surprised by it as my other thermo flask was not as good as this. Definitely 5*
Really good
Filled it with hot chocolate at 4:00 took it to football match that Evening lovely hot drink at had time and again on the way home after the match. Cleaned it out the following morning and it was still hot. But a strange taste. Maybe the milk had gone off but good produc
Hot things hot or cold things cold, iiiiiiiiits grrrea
It is mostly very good at doing as it is told. It keeps things close to the original temperature for hours and hours.
It won’t do the hoovering or washing up which is disappointing
Never write reviews but this changed my life
I work outside so spent a few weeks looking for the perfect thermos and food flask. This thermos genuinely keeps my tea STEAMING hot for 12 hours. I’m amazed and now no longer only use it for work – I’m considering going hiking as I have the equipment for it.
Again, I literally never write reviews but wow this blew me away.
Why haven't I had one of these for years!!!
Amazing piece of kit. Stays piping hot entire day and really robust design. Made coffee on Monday morning, drank 2 cups and stupidly left in car overnight at 2 degrees. Tuesday morning still warm enough to drink. Highly recommended.
Very good product. Keeps drink as out of kettle!
Very good as don’t have to boil kettle all the time at home , and for walks or pickings
Impact resistant flask
I take vacuum flask with me whenever I go surfing and in the last 6 months broke the glass vacuum component of two Thermos flasks when roughly handling them…usually when they fall out of my van. But since buying this item Ive had no breakages as there is no glass , just a metal vacuum component. So pleased I discovered this item which should last me years. And they keep hot water hot for over 20 hours…very useful when in the wilds.
Excellent quality
Really good product – excellent quality. Only comment would be that I would have liked a fixed handle as this one is a bit ‘rattled’ – would definitely recommend
Best flask I've ever brough
This flask truly keeps your drinks extremely hot, the longest I’ve tried so far is 15 hours & still too hot to drink straight away,
Just remember to warm the flask up with hot water 1st then empty & add your coffee or tea,
The flask is strong, doesn’t leak like those with the popper stoppers
Thermos Flask 1.2 L
I bought the Thermos 470ml drinking mug a while back and it amazed me how long it keeps your drink hot, at least 7 to 8 hours. So I though I would treat my self to the 1.2 Ltr flask. I have too say I’m not dissapointed. I make a full flask and use it to refill my thermos mug. Hot drinks all day long. It works great keeping the drink hot for 8 hours or more. I tested it by leaving some in it over night and the next morning it was still slightly warm. My only very small niggle is the spout is tiny for getting in there to wash it out. So I’ve taken to shake a lot of soapy water about and rinse. Sill worth the money and a great strong hopefully unbreakable flask
Best Quality flask
This is the best quality flask I’ve tried…..I’ve tried a few and sent them back as they seemed poor quality and I didn’t think they would last long. But this is all made of metal and should last many years.
Highly recommended.
Keeps liquid really ho
Great flash, good size and keeps liquid really hot for 12 hours minimum. Loved the fact you could pour without having to take the stopper out completely.
Hot drinks while fishing
No dislikes,i have another one but wanted more hot drinks while fishing so no hesitation in buying one now i have hot drinks all day perfec
Good Produc
Bought this as an Xmas gift. Pleased with my purchase, was as advertised, fast delivery and well packaged. Would use this supplier again.
Great flask
Big and sturdy, feels good and premium.
My only issue is the handle is very clunky – when you’re pouring it the handle can move around which obviously isn’t the safest. I’d rather just have a static handle.
It would also be nice if the cup had some sort of rubber round it for comfort when you’re drinking hot tea etc.
Other than that… Great flask & happy with the purchase
Good quality
Keeps my tea warm for a full day and take it to work everyday its good quality.
A quality item
Good looking flask just wished the handle didn’t rattle. Great flask and really does work well keeping water for tea hot.
Excelle
I was a bit hesitating after reading the negative reviews but still decided to give it a go as per the positive reviews and the design.
Today I’ve put boiling water into the thermos at around 8 am to warm it up. Then I pured this water out and pured in fresh hot water. The water was still hot by 5 pm. This is all I need from a thermos, to keep the water hot/very warm up to 8-9 hours. It’ll still be very warm/warm later, but in my case it never lasts so long 🙂
A Good Item
Needed a flask for work. Very good branded item. Sturdy. I like the carry handle on the side. I have only given 4 stars because my item had not been well packaged and the lid of the cup was bashed on arrival but in general good item.
Classic Thermos
This is a very sturdy well made Thermos.
We have had a Thermos in the family for around 20 years or more that is used every day on a building site that still works perfectly however looking a little tired and beaten, so we decided to update.
This looks and feels exactly the same as the old one and works just as good, keeps the tea hot all day without fail.
It feels just as well made and can see this lasting another 20 years. For the price and what we use it for it is well worth every penny.
Would recommend to anyone
Stays hot all day
Delighted with this flask, I’ve been using it for months now and it has been perfect. It’s taken a few knocks, but because there’s no glass it didn’t shatter. It keeps the contents very hot for a long time- I mostly just use it for boiling water and make the tea fresh, it is hot enough to do that properly. Would definitely recommend
Stays hot all day
Delighted with this flask, I’ve been using it for months now and it has been perfect. It’s taken a few knocks, but because there’s no glass it didn’t shatter. It keeps the contents very hot for a long time- I mostly just use it for boiling water and make the tea fresh, it is hot enough to do that properly. Would definitely recommend
Really great produc
I’d been looking for a flask for ages. This one is brilliant. It’s the perfect size for 2 people. I used this when we went on an overnight journey. I was amazed to find the left over coffee was warm enough to drink 30 hours after it was made. Colour is lovely and product is sturdy without being heavy. So pleased with my purchase.
It does stay hot for 24hrs. !!!!!
Amazed at how long hot stuff stays hot in this thermos flask. As an HGV driver who works fifteen hour shifts its good to know that if there’s any water left in the flask it’s still good enough for a hot brew at the end of the shift. The only improvement I would liketo see for a flask this size is to have two cups to share with.
Only flask that has worked!
Use this flask for fishing. Filled at 06.00 the remaining water is still at around 70 degC at 19.00.
Several drinks during the day are all too hot to drink when poured. A great flask.
Light weigh
Happy with purchase, does exactly what’s expected. Keeps water hot 🙂 thanks.
Keeps Ho
This flask keeps tea or coffee hot for a long time. Just don’t put your finger in to test it after 12 hours or you will get burned.
All Round Quality
I bought this for my son to use at work. He is really pleased with it. Holds plenty for a full day and it stays piping hot for at least 24 hours. I am thoroughly impressed. If you are looking for a flask, I definitely would go for this one.
Excellent Heat Retentio
I’ve bought and owned so many thermos flasks over the years. None of them have ever come anywhere near the level of performance in terms of heat retention as this one. Absolutely fantastic and definitely 5 star rated!
Excellent Heat Retentio
I’ve bought and owned so many thermos flasks over the years. None of them have ever come anywhere near the level of performance in terms of heat retention as this one. Absolutely fantastic and definitely 5 star rated!
Wow, you got to get this.
Ideal for holding hot water for over 24 hours, I rely on it for giving me hot water when making instant coffee from pouches. I couldn’t believe it, when I started pouring water out of it, I could see steam and I knew that my coffee will be lovely and enjoyable.
Buy this NOW
This product had been absolute GOLD. literally cannot complain. My husband is a roofer and is outside all day. I make him coffee in this at 7am and I’m not joking when I say sometimes he’s doesn’t drink it all and when I pour it out to wash THE NEXT MORNING…its still not . I am so impressed with this product is FANTASTIC
My best buy
Since I have bought this bottle my life has been so easy I take this bottle when ever I have to travel like 8 to 9 hour journey im talking about the water stay warm all the water I wanted to make a milk for my 8 months old baby .water stays warm as its Says for 24 hour I take this bottle with me to my room aswel at night time to make a baby milk water stay warm all night this is truly a best gift bought for my self as new mum definitely remmcomed to other parents too if u young babies at home
Really nice colour and fab quality
Love it. It looks really good quality too. Would definitely buy again and recommend it to anyone
My positive 1st 28 hours
Upon arrival I washed flask with hot soapy water. Pre warmed with boiling water, then filled with boiling water. I then placed the flask outside at 11am.
Next day 24 hours later the water was to hot for me to keep my finger in.
It's called king for a reaso
Keeps water temperature for a long time. Excellent and clean pouring system: no springs, buttons or any weird mechanisms on lid, just a solid cap that you can unscrew a bit for pouring. This means less accumulation on parts that are difficult to clean and also fewer weak points.
The handle is sturdy.
Finally, looks good. I got the dark grey one, looks like the bat-thermos. Recommend!
Brillia
Brilliant coffee hot all day the se flask is 25 at Tesco and only18 at Amazo
A must have item!
We filled coffee from London and drove to Inverness (14 hours drive) and the coffee was freaky hot till then.
Would highly recommend this and would purchase another one to carry hot water.
Grea
Keeps my coffee hot all day, make it in the morning around 7 and it’s still hot at 5 in the evening. Tested it with hot water one night filled at 6pm and was still hot at 7am next day.
A must have item!
We filled coffee from London and drove to Inverness (14 hours drive) and the coffee was freaky hot till then.
Would highly recommend this and would purchase another one to carry hot water.
Grea
Keeps my coffee hot all day, make it in the morning around 7 and it’s still hot at 5 in the evening. Tested it with hot water one night filled at 6pm and was still hot at 7am next day.
Keeps liquid ho
I am so pleased. Did not realise previous was so ineffective. As long as not open up fully have hot water 16+ hours later, could be beyond but have not needed to try. The temp goes down but still too hot to drink without sipping. Handle does not folder away easily. Got the gold and colour is fantastic. Partial release of screw cap allow water to be poured. Some heat escapes via cup area , but not sufficient to drop a star. Not tried keeping cold yet.
well insulated, solid and excellent quality.
We researched flasks for a long time. We kept buying cheaper version and the main problem with those was that the lid would break really easy and the seal would fail. We found that even good quality flasks with the pop-up lid seal would break easily. This was because it was easy to overfill and then the pop-down mechanism would fail and could not be fixed. When this happened on a hike (as it often did) the flask would leak everywhere. We generally placed out flasks in plastic sealed bags as we expected that, after a few months, the flask would leak everywhere. This flasks was the answer.
It keeps things piping hot for long periods, much longer than cheaper flasks. It has a good build quality and, most especially, the lid is designed so that it does not break. We have had lots of different flasks and this is, by far, the best. We have solar PV and now have two of these flasks to keep hot water for morning coffee overnight.
Pros: Length of time things remain hot (e.g. overnight). Build quality (very solid metal casing). Lid design. Doesn’t leak!
Cons: Only one cup comes with the flask but the capacity is definitely for two people (1.2 L in our case). Outer coating tends to scratch so this flask will not stay pristine if you are using it for hiking etc. as we do. Although it has not happened yet, it feels like metal casing might be prone to minor denting.
In spite of cons (which are very minor) this is highly recommended, great product.