Patent ID: 8240474

Claim:
A packaging article comprising: a first packaging member having one or more depressions on a first surface thereof; and a second packaging member having one or more protrusions on a first surface thereof, wherein: the first and second packaging members are arranged to be assembled together with their respective first surfaces facing one another and with each protrusion of the second packaging member at least partly received within a corresponding one of the one or more depressions of the first packaging member; a transverse cross section of each depression is concave; and a transverse cross section, substantially parallel to the transverse cross section of the corresponding depression, of each protrusion includes a secondary protrusion, which secondary protrusion forms a ridge on the corresponding protrusion that extends along a first direction that is substantially orthogonal to the transverse cross section of the corresponding depression, wherein a cross section, substantially orthogonal to the transverse cross sections, of the ridge comprises a series of one or more concavities arranged along the first direction.