The rangefinders are usually packed by EVA cases. In the design progress, the following factors should be considered: 1. The case's supportive capacity. The selection of the EVA material should meet a certain thickness and stiffness requirements so when the case is molded it can pass a certain pressure test. 2. The layout of the overall structure of the case and the opening and closing mold should be convenient for the device to be put in and taken out. 3. On the selection of the liner materials and accessories, one thing should be kept in mind they should provide effective protection to the device and should not scratch the surface of it. The materials used on this kind of EVA case are mainly synthetic leather, oxford fabrics, EVA sheets, zippers, metal buckles, etc. And some customers even request a microfiber pouch to better protect their rangefinders.