Mophie is launching their first iPhone case...with a twist. Their new hold force system starts with their base case (for iPhone 7), which features magnetic plates that can attach to a variety of accessories. The system will launch with three accessory options: a card wallet, folio, and of course, a battery. It's a great solution for anyone who finds battery cases to be too thick, giving you the option to bring a battery only when you need it and neatly organizing your pocket contents at the same time. 

From $40, mophie.com