Disclosed is a sleeve-type mortise-and-tenon joint structure unit, comprising: an externally wrapping pipe-type frame (1) and several internally supported pipe-type frames (2) disposed in the externally wrapping pipe-type frame. The externally wrapping pipe-type frame is provided with several openings (3). After some or all of the internally supported pipe-type frames are pulled out of an end part of the externally wrapping pipe-type frame, a vacant part (4) is formed in the externally wrapping pipe-type frame, and the openings and the vacant part form a mortise structure. Further disclosed are two applications of the sleeve-type mortise-and-tenon joint structure unit. The above-mentioned sleeve-type mortise-and-tenon joint structure unit has the advantages of requiring no nail or binder, a stable structure, rapid and convenient assembly and disassembly, durability, lightweightness, reusability, and environmental friendliness.

A packaging material is formed from a shock-absorbing plate material and stored in a packaging box with a packaged article. The packaging material includes a base portion and a shock absorbing portion. The shock absorbing portion surrounds three sides of a space along a main surface of the base portion. First and second vertical plate portions of the shock absorbing portion face each other and continue to the base portion. In the shock absorbing portion, a third vertical plate portion continues to the second vertical plate portion, and a fourth vertical plate portion continues to the third vertical plate portion. The fourth vertical plate portion is overlaped on the first vertical plate portion. A hook portion of the shock absorbing portion continues to the fourth vertical plate portion, and has a second cut in which a bottom portion of the first cut of the first vertical plate portion is inserted.

A collection of articles is disclosed. The collection of articles has a supporting medium and a first plurality of parallelepiped containers arranged in a first layer upon the supporting medium. Each parallelepiped container of the first plurality of parallelepiped containers is disposed adjacent each other to define a first space therebetween. A first portion of the first sidewall of the first parallelepiped container disposed within the first space is bonded to a first portion of the first sidewall of the second parallelepiped container disposed within the first space when the first parallelepiped container and the second parallelepiped container are in contacting engagement. A top of a third parallelepiped container of the first plurality of parallelepiped containers is bonded to a bottom of a third parallelepiped container of the second plurality of parallelepiped containers at least partially coextensive thereto.