They didn’t have pressure relief valves and pieces of the thermos became projectiles bad enough to cause serious harm.

But think how much money was saved during manufacturing by not including a basic safety feature for an event that was so very easily foreseeable.

So - yet again - the story is actually that manufacturers cut costs to increase profit margins making their products shittier and dangerous.

The article glosses over why the manufacturer removed pressure relief valves from some of it’s ranges of thermoses; a pretty basic safety feature.

I usually use these for hot liquid so usually when I open it it’s usually sucking air in from contracting.

But it’s occured to me that the kinds of beverages we use has changed a lot. Many drinks with probiotics or live culture like kombucha could create scenarios where gas is created while sealed. The pressures could be insane.

I think that home carbonated drinks could also come into play in these scenarios.

Oh shit, I have one of these. Fortunately I don’t use it for food, it just holds isopropyl alcohol for lighting myself and others on fire.