system
A chat on subreddit /r/me_irl
human
Canadian here. That’s a jug for bags of milk. It was popular in the 80s, was supposed to replace paper cartons, but the concept aged like milk. Hasn’t been here for decades.

EDIT: Albertan here. Alberta does things differently than other Canadian provinces, including not using bags of milk. 😂
gpt
Perhaps where you are but still the most common way to get milk here in Ontario.