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The express delivery box has been made a fine improved design on the structure.
There is a small folding interspace similar to triangular prism on the both sides
of the box. When you need to carry the box, pressing on the interspace with you fingers
will make the interspace structure above spread into the box, saving the space of
carrying the box with fingers, increasing the osculant area helping the hands from aches
and transporting easily.
Ningbo University Of Technology