What point are you trying to make here ?!?!
Given that it should be there, it is quite clearly a product feature on Thermos jars.
So, of many examples that cross my mind.... let's say you were a long-term user of Thermos products. There's your "expectation".
I assume it probably features in the product literature that comes in the box too.
I've never seen a thermos-style container with a pressure relief in my life. However, I'm European, it appears that in the US (a country where you have to write disclaimers on microwaves that you shouldn't dry hamsters in them) common sense has been going down the toilet.
Frankly, I'm all for a bit of darwinism here. It's bewildering that there are people who think it's a good idea to open a thermos that has been fermenting for days if not weeks without a lot of caution!
I said "given it should be there" because Thermos have just issued a recall notice where they openly admit liability and they openly state it should be there (see side by side photos in the recall).
I was never seeking to pass judgement on the factual element of whether "it should be there" in the pure definition of the term.
I was just saying "it should be there on THAT product because Thermos says so".
