Already got the milton one. Might look at this in future. But i am guessing that there is a reason why they use plastic. Else they can always have both products, with steel cap one as the premium variant.
So the milton one is good enough for my usecase, water was hot enough all night.
There is a big difference between this and the one that doesnt work - the body remains basically cold due to vacuum insulation whereas the broken one gets pretty warm. This is a simple way to see if the insulation has failed.
When its working, i noticed that the cap gets slightly warm. We cant have have the same insulation here and cap seems like the main way the bottle looses heat. So ideally cap has to be made of something that insulates better, and metal cap i am guessing will be worse.
Just guessing, dunno. The best bottles probably have the best cap design .
What i will do as a habit is try to avoid/reduce water contact with plastic. Wont fill it 100% but close to it and will keep it static, this is fine for my use. The small cap one is maybe better than the flip one for this.
I have used the double-walled Milton stainless steel flasks for several years and they work well to keep the contents hot for at least 8 hours if not more. The one you first purchased is just a water bottle (i.e.) not double walled.
These flasks are quite tough due to being all steel and have survived a lot of abuse from frequent drops/falls. The inner glass walled flasks that were common earlier are the traditional design and are really good but were prone to the inner glass bottle breaking from rough handling unless some of the newer designs use a break resistant design.
The inside cap insert of the Milton flask is plastic with what feels like a silicone gasket (though it could be plastic too) for a better seal.
One usage tip if filling with boiling water is to not allow it to touch the plastic insert. I used to do this and noticed over time that the plastic insert was breaking down into micro-plastic particles which would then get in the water. I am not sure if I just got a lemon or this is a problem with the insert material due to repeated contact with boiling water.
No it is double walled and we have another one of same type that does work. Perhaps it had a manufacturing defect, dunno. I think i did not check back then because i did not think that it could be broken.
Good to know. The potential issue was that a bump might close the vacuum gap and insulation could fail. Just guessing, i havenāt seen it happen. That said, my non working bottle doesnt have any bumps, so again maybe it was defective from start.
And yeah, the other one has been working for many years, and i would guess that it would have seen some abuse.
Yeah, i will do same. Also i donāt use boiling water - just hot but drinkable, and it held reasonably hot overnight. So good enough for me and hopefully this reduces the risk of plastic.
They may be tough from outside but since there is a vacuum between them . A single drop can create lot of vibration and impact force internally and even a hairline level fracture is enough to render it useless in terms of keeping it hot/cold or you will start noticing the difference in performance once it develops a fracture.
It just becomes a normal water bottle.
I keep my expensive thermos only for my serious outdoor activity and even then I have put layers to protect it.
For normal day to day use at home . I use Milton only.
It really looks like you might have got a well built one in that case.
Some of the older versions. I am talking about decades ago. were very well built and they were much heavier also. I am talking about old days when we use to take those in train journerys and all.
These days its gone much lighter so there seems to be some compromise in quality but still gets the job done.
Thatās true. The quality of most steel utensils these days is horrible. Wafer thin junk that rusts easily. Stuff from decades ago is of superb quality, solid, no rusting given the same environmental conditions.
