This is a modern sophisticated version you have here. The ones I'm speaking about were made of the typical clear thick glass over-sized bottle container as big as in the picture you have here. It had a simple metal screw off top under pressure, inside with a white plastic downward cupped retainer cover to maintain the pressure and preserve the taste so it would not go 'flat.'This, in itself, is a reason to celebrate!
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That reminds me of my elder sister. She was having her 16th birthday bash inside the garage with all her neighbor friends. She snuck in the frig and unscrewed a flagon or two so they has to be either chucked out fairly quickly or drank even quicker. That was her plan. My Dad caught on and gave her what for.....maybe he wanted to keep the excess beer for himself and his mates come to think of it...