A crafty marriage of 2 ideas and concepts. One is based on the verb CAN. An ability to do something. Being that the nature of the can, ENABLES the consumer to be more flexible. Portability and ease of use majorly come to mind. The second is the noun CAN, the container or receptacle that is used to bear a specific content.
A third reason, is partly coming off the popularization of the phrase YES YOU CAN, that swept the incumbent head of state of the USA, into power. A message that resonates as well as it is current and with the times.