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When used purely for hot water, it does indeed last 24 hours, in fairly cold conditions. One can still make a decent tea or coffee after the water has been stored 24 hours, during camping trips when the temperature drops to 5C over night. It is very well built and does not leak when the stopper is properly tightened, even after a year of use. The amount of times I've dropped this flask but still it keeps performing well. Sure, there are cheaper flasks and there are ones with higher capacity but for all out durability and heat keeping without breaking into the realms of the £50 plus Stanley Master, the Thermos Hercules is excellent. It does have to be said that, once one starts emptying the flask, the inside temperature tends to cool more rapidly. I have not been in place to put its floating function to test but I'm sure it would perform as stated.Read full review
Verified purchase: No
Verified purchase: Yes | Condition: New
I've tried a few flasks in my time thinking cheap is good but cheap is not good you will get years out of this one I travel all over the country driving machines so you need a brew this one will do it
Verified purchase: Yes | Condition: New
Verified purchase: Yes | Condition: New
Very good flask looks like it will take a bit of knocking about keeps liquids really hot for about 16 hours.
Verified purchase: Yes | Condition: New