RayBan Aviator simple sunglass case

This is a simple case for Ray-Ban Aviator sunglasses. The intent is for it to be very slim so it takes up hardly any more space than the glasses, yet sturdy enough to offer real protection. All the cases I see in the stores are either soft (so they protect against scratches but not smacks or crushes), or bulky (five times the size of the glasses). This is a first try; it doesn't have a lid (but the glasses fit so snugly it might not need them, yet slide free easily) or a clip (I plan to make variations with a shirt clip and a sun-visor clip).