well, I want to reassure any potential buyer: it is not. So yes, like buying a single ream, it is not delivered in a box 5 reams that prevents them from moving (as can be seen in the office), then, yes, I had a corner slightly torn but the paper did not suffer. And this tear was so minimal that I refer to it to demonstrate the reality of the thing.
Nothing to say on paper quality at 80g. Impeccable. I do not regret my purchase.