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Obligatory XKCD:

This is essentially the "No Name" brand in Canada.

This used to exist in the US as well:

I remember these being an entire aisle in the grocery store in the 80s. I think they've been replaced by store brands with more colorful packaging

Walmart did this back in 2013 under the Price First label. About 3 years later they dropped it.

Also, there is a generic-as-a-brand brand in Japan, “Muji”: https://www.muji.com/jp/ja/store

FWIW, the full name is 無印良品. Mujirushi ryouhin. 無(mu)印(jirushi)良(ryou)品(hin). Literally "no mark good goods".

This generic packaging appeared in the movie "Repo Man" [1], apparently based on similar grocery store products [2].