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packets of ketchup are super wasteful
(lemmy.ml)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
Mostly it's cardboard with a small amount of plastic around the card itself so you can see what you're buying (and presumably so you can also see that somebody hasn't discretely opens the packet and nicked the card).