Beer first came in bottles with caps lined with cork.
Then, a sadist invented the steel can and God retaliated with 'church keys.'
Some time later, aluminum cans came along with 'pop tops.' These were the metal rings with attached wedge shaped can shrapnel capable of eviscerating a buffalo.
Next the attached pop top cans appeared.
Twist off caps and thin walled glass bottles became the container of choice for bad beer everywhere.
Finally, the beer gods returned us to heavy brown bottles with pop tops lined with food grade plastic.