Last May, OtterBox, a leader in rugged smartphone cases, introduced a rather intriguing idea. A rugged iPhone case, of course, that can be extended with different sorts of attachments. A pseudo modular smartphone system, if you will. One of those to first jump into that OtterBox uniVERSE was Goal Zero with its Slide Battery. And now, in addition to finally launching that attachment, it is adding yet another member to the team, the Nomad Folio cover that adds a dash of renewable solar energy to your portable battery needs.