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Here's a video on soda can design: https://www.youtube.com/watch?v=hUhisi2FBuw

Wow. That was an awesome video. Thank you. I didn't know why the top had a neck. Further efficiency apparently. He has an excellent explanation of the two-mode pull tab towards the end. Direct link:

https://www.youtube.com/watch?v=hUhisi2FBuw&t=508

I hated that original pull tab design as a kid. Those sharp edges were vicious.

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