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Amazon has a Thermos 16 oz Stainless steel commuter bottle that stays hot for 8 hours if in USI am looking for a good thermos flask to keep about 500ml (1 pint to our American friends) of coffee piping hot for 5 or 6 hours, say, when I want to take a coffee break on the road ( I know the best flask at such times is actually a café, but please bear with me for a moment).
When I asked for a thermos flask in an equipment shop the staff did not know what a thermos flask was and showed me cheap containers with insulation between the double walls that masqueraded as real vacuum flasks.
So, if anyone can point me to a good thermos flask I would sing your praises to the heavens - and drink a toast to you every time I used it.
Bob M
Amazon has a Thermos 16 oz Stainless steel commuter bottle that stays hot for 8 hours . . .
Yeti has a good reputation - and yes, it is a true vacuum bottle. There are more than several choices, but this is what I believe you might be looking for:Yeti brand is supposed to be amazing keeping things hot or cold
Well spotted, now fixed. Yours is a different flask to mine but no doubt just as good.I can second the Zojirushi. Jeff seems to have mis-linked so here you go.
It's like the old engineering triad of cheap/light/strong - pick any two i.e. you can have cheap and light but it won't be strong.Are there any good light-weight ones? Sigg looks good, but hauling an extra 310gr / 11 oz.. day in day out just for the pleasure of a morning cup of coffee seems excessive.
Replace the rice cooker? What heresy is this?We also think highly of Zojirushi and find the Tiger brand (also Japanese ) just as good.
Their food containers are also great and can be used to prepare rice. Put rice in, add boiling water, screw tight and it cooks in a few hours.
(Robo, this might replace the rice cooker!)
Anything made by Yeti keeps drinks cold or hot up to and beyond 24 hrs. Expensive but worth it. Try Bass Pro or CabellasI am looking for a good thermos flask to keep about 500ml (1 pint to our American friends) of coffee piping hot for 5 or 6 hours, say, when I want to take a coffee break on the road ( I know the best flask at such times is actually a café, but please bear with me for a moment).
When I asked for a thermos flask in an equipment shop the staff did not know what a thermos flask was and showed me cheap containers with insulation between the double walls that masqueraded as real vacuum flasks.
So, if anyone can point me to a good thermos flask I would sing your praises to the heavens - and drink a toast to you every time I used it.
Bob M
. . . does anyone have a link to a study by a site like backing packing lite or backcountry gear that reviewed a set of them for which worked best?
As I said above. Yes. Very much so. I love the one I have.I assume Sigg flasks are equally solid and reliable.
I'll bite.Any questions?
What if you preheat or pre-cool the flask? That doesn't change the ambient deltaT, but it adds a bit of time to how long things stay hot or cold, yes?
That's not me. But good to know the advantage. I'll keep pre-heating my Sigg.engineering students studying heat transfer learn how to do such calculations. It fills in the time.
OK a link of reviews by backpacking sites as most of us have a only had a few of the current for sale thermoses.This is a great thread but does anyone have a link to a study by a site like backing packing lite or backcountry gear that reviewed a set of them for which worked best?
You need to take into account the specific gravity (density) of the materials involved (flask, liquid etc.) as well as their masses and relative temperatures: calorimetry, one of the few parts of thermodynamics I can still recall!An excellent point. I like the way you question assertions. A very valuable trait.
Preheating/cooling the flask will reduce the immediate heat loss/gain caused if the drink itself had to heat/cool the flask and lose/gain temperature as a result, so it definitely gives you an advantage.
You can calculate the advantage knowing the thermal properties of the flask and engineering students studying heat transfer learn how to do such calculations. It fills in the time.
Bob M
These links are great, but don't appear to have confirmed the manufacturers performance claims with other testing.OK a link of reviews by backpacking sites as most of us have a only had a few of the current for sale thermoses.
We Tested a Bunch of Insulated Thermoses to Guarantee Steaming Hot Coffee and Ice-Cold Water
We tried out thermoses from brands like Stanley, Yeti, and Otterbox to find the best insulated containers for your lunch.www.popularmechanics.com 12 Best Hiking and Camping Thermoses | KeepitHot
One of the main essentials that must never be forgotten while packing for your hiking or camping trip is definitely a reliable thermos flask! A thermos will keep your food and drinks at the desired temperature throughout your trip regardless of the weather conditions. How to pick the best hiking...keepithot.co The 9 Best Thermoses & Insulated Bottles [2023 Update] - My Open Country
Looking for the best thermos for your hiking and camping adventures? Our guide has you covered!myopencountry.com thermos - Backpacking Light
anyone use a nalgene with insulation for thermos, my thermos lid is leaking and waiting to hear back from snow peak if they have replacement lids for there kanpai thermos,...backpackinglight.com 10 Best Thermoses for Hunting in 2021 - Outdoor Gear Up
A thermos is the perfect addition to your next hunting trip. Make sure you pick the right one by checking out the top ten best thermoses for hunting!www.outdoorgearup.com
Please note those are only the first I found with a backpacking thermos reviews
These links are great, but don't appear to have confirmed the manufacturers performance claims with other testing.
I have tested a variety of vacuum flasks that I have collected over the years. Salewa, Stanley and Kathmandu all produce 500 ml flasks that have good heat retention properties. The standout performer in my current collection is from Kathmandu. This is a flask that I bought heavily discounted on sale. The flask is the lightest of the three, and heat retention is only a little less than the Salewa.
Note that older Kathmandu flasks of this size did not perform as well as the Salewa, and I might have been just lucky getting one that was a good performer.
Also note that these smaller flasks don't keep water hot enough to brew tea for more than a couple of hours, but are still fine for making coffee after three or four hours.
Here are the results of a test I ran today on four small flasks:I am glad that you like them I was hoping one of them was more a a group test of the flacks but I only posted the first five google hit. I didn't read them but would love to know if there is a study of say 5-10 of the top flacks of the temp taken once an hours for ten hours.
Time | Lifeventure 350ml | Stanley 500ml | Kathmandu 500ml | Salewa 500ml |
Pre Heat Temp (C) | 95 | 95 | 96 | 96 |
10 min | 96 | 97 | 97 | 98 |
1 hour | 89 | 94 | 93 | 93 |
4 hours | 75 | 85 | 84 | 85 |
Weight Full, gm | 619 | 919 | 802 | 886 |
Weight Empty | 292 | 449 | 328 | 405 |
Effective Capacity | 327 | 470 | 474 | 481 |
Thank youHere are the results of a test I ran today on four small flasks:
Time Lifeventure 350ml Stanley 500ml Kathmandu 500ml Salewa 500m Pre Heat Temp (C) 95 95 96 96 10 min 96 97 97 98 1 hour 89 94 93 93 4 hours 75 85 84 85 Weight Full, gm 619 919 802 886 Weight Empty 292 449 328 405 Effective Capacity 327 470 474 481
I live at an elevation of about 550 m ASL, so water boils at a little under 100 deg C. The ambient- temperature at the time of fill was 20 deg C, and each flask was pre-heated for five minutes before being refilled with freshly boiled water. The test procedure might have slightly favoured the Lifeventure and Stanley flasks over the Kathmandu and Salewa, but for these purposes, I doubt there was much in it.
Edited following a second capacity measurement.
I would be speculating. There are differences in design between the four flasks. For example, the Salewa and Kathmandu flasks are essentially the same height, but the Kathmandu flask diameter its slightly larger, hence has a slightly larger total volume. Given that the Kathmandu flask has slightly less effective volume, it implies that the internal diameter of the flask will be slightly less. Further, given that the Kathmandu flask is also lighter, any volume differences cannot be explained by material thickness, but can be explained by the Kathmandu having a larger vacuum space, ie by having a greater separation between the inner and outer walls of the flask. This would clearly influence the performance of the flask. The Salewa design or manufacturing process might create advantages that I cannot detect that balance that out.Doug
That’s excellent.
Do you think that ‘big is better’ explains a good proportion of the difference in performance?
The lifeventure flask performs least well, but is quite considerably the smallest in volume.
David
Here are the results of today's testing activity:If I can find the time, I might see if I can find a selection of one litre flasks to test whether they perform better than the 500 ml flasks. If they did, I would feel more comfortable suggesting larger is better is a reasonable statement to make.
Time | Alladin 0.95 li | Thermos ~ 1 litre (capacity not stated) | No name hot/cold flask ~500 ml |
Preheat (deg C) | 95 | 96 | 95 |
10 min | 99 | 99 | 97 |
1 hour | 96 | 96 | 93 |
4 hours | 91 | 89 | 80 |
Weight Full (gm) | 2104 | 1694 | 755 |
Empty | 1188 | 728 | 295 |
Effective capacity | 916 | 966 | 460 |
Impressive research Doug. I was going to do something similar with my Zoji's - just need to find the thermometer!Here are the results of a test I ran today on four small flasks:
Time Lifeventure 350ml Stanley 500ml Kathmandu 500ml Salewa 500m Pre Heat Temp (C) 95 95 96 96 10 min 96 97 97 98 1 hour 89 94 93 93 4 hours 75 85 84 85 Weight Full, gm 619 919 802 886 Weight Empty 292 449 328 405 Effective Capacity 327 470 474 481
I live at an elevation of about 550 m ASL, so water boils at a little under 100 deg C. The ambient- temperature at the time of fill was 20 deg C, and each flask was pre-heated for five minutes before being refilled with freshly boiled water. The test procedure might have slightly favoured the Lifeventure and Stanley flasks over the Kathmandu and Salewa, but for these purposes, I doubt there was much in it.
Edited following a second capacity measurement.
So in the end I did the experiment this evening:Here are the results of a test I ran today on four small flasks:
Time Lifeventure 350ml Stanley 500ml Kathmandu 500ml Salewa 500ml Pre Heat Temp (C) 95 95 96 96 10 min 96 97 97 98 1 hour 89 94 93 93 4 hours 75 85 84 85 Weight Full, gm 619 919 802 886 Weight Empty 292 449 328 405 Effective Capacity 327 470 474 481
I live at an elevation of about 550 m ASL, so water boils at a little under 100 deg C. The ambient- temperature at the time of fill was 20 deg C, and each flask was pre-heated for five minutes before being refilled with freshly boiled water. The test procedure might have slightly favoured the Lifeventure and Stanley flasks over the Kathmandu and Salewa, but for these purposes, I doubt there was much in it.
Edited following a second capacity measurement.
Time | Lifeventure 350ml | Stanley 500ml | Kathmandu 500ml | Salewa 500ml | Zojirushi 400ml | Zojirushi 400ml |
Pre Heat Temp (C) | 95 | 95 | 96 | 96 | 23.7 | 96.4 |
10 min | 96 | 97 | 97 | 98 | 94.1 | 96.7 |
1 hour | 89 | 94 | 93 | 93 | 87.8 | 89.7 |
4 hours | 75 | 85 | 84 | 85 | 71.2 | 72.1 |
Weight Full, gm | 619 | 919 | 802 | 886 | 668 | 664 |
Weight Empty | 292 | 449 | 328 | 405 | 296 | 290 |
Effective Capacity | 327 | 470 | 474 | 481 | 375 | 375 |
They are awfully heavy aren't they?I recommend yeti and hydro flask. I have both brands of thermos flasks, and I like them too. Although their prices are a bit expensive, they are worth the money. You can decide which one you need in the comparative article: https://www.gearhunder.com/yeti-vs-hydro-flask/
We use Stanley flasks. They come with a lifetime replacement warrantyI recommend yeti and hydro flask. I have both brands of thermos flasks, and I like them too. Although their prices are a bit expensive, they are worth the money. You can decide which one you need in the comparative article: https://www.gearhunder.com/yeti-vs-hydro-flask/
Stanley,and comes with a lifetime WarrantyI am looking for a good thermos flask to keep about 500ml (1 pint to our American friends) of coffee piping hot for 5 or 6 hours, say, when I want to take a coffee break on the road ( I know the best flask at such times is actually a café, but please bear with me for a moment).
When I asked for a thermos flask in an equipment shop the staff did not know what a thermos flask was and showed me cheap containers with insulation between the double walls that masqueraded as real vacuum flasks.
So, if anyone can point me to a good thermos flask I would sing your praises to the heavens - and drink a toast to you every time I used it.
Bob M
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