US Patent 10246214 Package box and foldable sheet material

A package box includes two top plate portions at its top side, which are superimposed on each other and detachably fixed with each other through an engagement structure. The package box includes two right side plate portions at its right side, which are superimposed on each other and detachably fixed with each other through an engagement structure. The package box includes two left side plate portions at its left side, which are superimposed on each other and detachably fixed with each other through an engagement structure. The package box can be opened from the top side, the right side, or the left side after the corresponding engagement structure is opened. The package box can be formed by folding a foldable sheet material.