At this year's Consumer Electronics Show, Mophie has announced the Space Pack, a backup battery case that comes with 16 or 32 GBs of local storage. Like the Juice Pack Air, the Space Pack has a 1700mAh non-removable battery that Mophie claims will recharge the iPhone to a 100% charge. Through a companion app, the Space Pack can store and retrieve videos, photos, documents, and more from its own internal storage. The 16 GB Space Pack will cost $149.95, while the 32 GB model will cost $179.95, going on sale March 14th.
Update 1/8/14: pre-orders are open.