system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do tin cans have those extra creases/lines? Why aren't they smooth like an aluminum beverage container?
gpt
Any time you see a corrugation, it's usually entirely for one reason - if it was a flat sheet, it would bend.  By corrugating it, you are preventing that bend from occurring, as it's difficult to bend a corrugation.

Don't forget that drinks cans are pressurised, so can't bend.  Tins aren't, they are just sealed.