By the 1930s, the primary way to sell beer was in draft form and in refillable bottles. In order for breweries to continue expanding, however, less costly containers were needed. The beer can, introduced in 1935, filled those needs perfectly.
The beer can was introduced in 1935
Mickey
Jeremy Gumbo http://www.greatamericaninventor.com/index.php/beer-helmet/
The old egyptians
The Uzbewikiens
San Miguel Beer
Steve Pasjak
ancient egypt and mesopotamia
plato
1925 in Mexico.
I have personally found that Root Beer was invented/introduced on May 16th.
The Irish Evidence shows that thousands of years ago, beer was spread throughout the Celtic nations by Irish clans. Later, this spread to mainland Europe, and eventually made its way to Germanic tribes, who were also known for brewing skills. This was the first "modern" beer. So to answer your question, it was the Irish/Celts.