SanDisk iXpand Memory Case
Maybe you thought 16GB in your phone would be enough. The SanDisk iXpand Memory Case gives you a do-over of sorts without resorting to selling your phone and buying a new one with more memory. An on-board 32, 64, or 128GB of fast flash memory stores tons of media – all automatically sorted and password protected – while the case protects your device from bumps and bruises. Plus, an optional add-on battery boosts your devices longevity as well, though it adds some additional bulk.
Pick one up at Amazon – $60+