This is a hybrid of JABAutomation's "Inhaler Case" design and Nibb31's "Frog Box v2.0" remix. Although this one is not waterproof, it's still durable design with sturdy pair of latches.

Additional hardware is needed and will require eight 20mm M3 screws. I did not include threads in this design like Nibb31's but instead sized the hinge and latch holes to allow the screws to cut their own.