I've seen it called "flip top", and "EZ cap", but it looks to me like "swing top" is more commonly used.
'Swing top' makes sense to me and is easy to remember!
Yep, that's what I call them too. "Swing-tops" or "swing-top stoppers".
I bought McDonalds yesterday. Stock, not burgers. But it made me think; they should give you the option to take part of your dividend as tax-free burgers.