3D Printable Glucose-Storing Cases

I need a set of sleek, modern iPhone cases that discreetly hold emergency dextrose tablets for Type 1 diabetics. The storage cavity sits on the back of the case and should take as many standard Dextro Energy tablets as will reasonably fit without making the phone bulky or uncomfortable to hold... (Budget: $30 - $250 USD, Jobs: 3D CAD, 3D Design, 3D File Scaling, Slicing & Print Preparation, 3D Modelling, 3D Print Design, 3D Printing, 3D Rendering, Fusion 360, iPhone, Product Design)