It is the new mail system for lightweight packages to and from China and Hong Kong. It was introduced for streamlining the mailing process since there has been an increase in things being ordered from vendors in China that must be shipped internationally.
According to some people on the internet, it takes about 2-3 weeks to ship and once it arrives in the US, it is shipped First Class Mail.
At a guess, its a zipped file sent by email
many many little tings u can buy the ferrari with epacket straight delivery from the china wit chinese man inside included