Packing can

A cylindrical packing can having a resistance against deformation by external pressure, comprising a cylindrical can wall having at least a portion thereof formed as a circumferential polyhedral wall having a plurality of structural unit faces, boundary ridgelines where the structural units touch each other, and crossing portions where the boundary ridgelines cross each other, wherein as compared with the boundary ridgelines and crossing portions, the structural unit faces are convex to the interior of the can, and the structural unit faces are arranged in a plurality of rows in both the circumferential direction and the axial direction of the can so that the adjacent rows of structural unit faces have a phase difference in the axial direction of the can, said structural unit faces satisfying requirements represented by the following formulae:

• 0.2.ltoreq.L/w.ltoreq.4
• wherein L represents the maximum length of the structural unit face in the axial direction of the can and w represents the width of the structural unit face in the circumferential direction, and
• 0.5.ltoreq.d/do.ltoreq.2
• wherein d indicates the depth of the dent of the structural unit face and do is equal to (r-s) in which s represents the distance between the center of the can barrel and the midpoint of the line connecting the crossing points corresponding to the maximum width in the circumferential direction of the can or the midpoint of the line connecting the points, corresponding to the maximum width in the circumferential direction, on the boundary ridgeline in the structural unit face and r represents the maximum radius of the can barrel.