1, different designs. A wide variety of sunglasses, style is different, different styles will have different styles of glasses boxes, boxes of glasses ordinary layman are basically the same.
 2, of different sizes. Almost the size of ordinary glasses, glasses case is almost as large, are the kind of rectangular. And what kind of sunglasses, large and small are, therefore boxes of glasses of different sizes. Nearly cuboid with flat, heart-shaped, there are close to the square, and so on.
 3, different functions. Ordinary glasses can be stored on it. In addition to sunglasses it must also be beautiful, easy to carry.
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