Abstract: An exemplary packing case (10) for substrates includes a main body (12), at least one buffer (14) and a cover (11). The cover is configured for attaching onto the main body. The main body includes a bottom plate (121) and a plurality of side walls (122) substantially perpendicularly extending from the bottom plate. The bottom plate and the side walls form an accommodating space. An inner surface of at least one of the side walls includes a plurality of first latching members. The at least one first buffer includes a plurality of second latching members. The second latching members and the first latching members of the at least one side wall have complementary shapes such that the at least one first buffer is detachably engagable with the at least one side wall thereby adjusting a capacity of the accommodating space.

Abstract: An exemplary folding container (20) includes a main body (22). The main body includes four fixed sidewalls (221), four folding sidewalls (222), and a bottom wall. The four fixed sidewalls, the bottom wall, and optionally the four folding sidewalls cooperatively form a receptacle. A size of the receptacle is adjustable according to a selected position of the four folding sidewalls.