box size

基本解释

Material selection, export structure design, and box size design are the key issues and difficulties of Fenzhouxiang millet packaging.
材料选择、倒出口结构设计、盒型尺寸设计是汾州香小米包装的重点与难点。
Wrought iron or steel scrap 1.4 inch and over in thickness individual pieces not over 60 inches x 18 inches (charging box size) prepared in a manner to insure compact charging.
厚度达到或者超过1/4英寸的的熟铁或废钢，单件不得超过60 英寸x 18 英寸（装料箱尺寸），以保证紧密装箱的方式准备好。
blog.sina.com.cn

As you can see above, the device is actually quite small, and most smartphones would have quite a bit of trouble fitting into a box that size.
FORBES: Turns Out the Ouya is Teeny Tiny
The sorter, housed in a glass box the size of a big fish tank, is looking for blood-forming stem cells, the precursors to the body's red and white blood cell lines.
FORBES: Magazine Article
The box, the size of a washer-dryer, was part of a signal system that lets drivers and dispatchers know where trains are.
NEWYORKER: Boss Rail