Abstract: A stackable storage box includes an upper box body and at least one modular storage unit. The upper box body includes a box bottom having a rotary portion and a positioning portion. The modular storage unit includes a lower base, an upper base and a drawer. The lower base includes a lower rotary portion and a lower positioning portion. The upper base includes an upper rotary portion and an upper positioning portion. The upper rotary portion is rotatably coupled with the rotary portion of the upper box body. The upper positioning portion is coupled with the positioning portion of the upper box body for positioning when the modular storage unit relative to the upper box body is rotated by a specific angle. A plurality of modular storage units can be rotatably stacked relative to one another and positioned with the upper and lower positioning portions combined.

Abstract: A stackable storage box includes an upper box body and at least one modular storage unit. The upper box body includes a box bottom having a rotary portion and a positioning portion. The modular storage unit includes a lower base, an upper base and a drawer. The lower base includes a lower rotary portion and a lower positioning portion. The upper base includes an upper rotary portion and an upper positioning portion. The upper rotary portion is rotatably coupled with the rotary portion of the upper box body. The upper positioning portion is coupled with the positioning portion of the upper box body for positioning when the modular storage unit relative to the upper box body is rotated by a specific angle. A plurality of modular storage units can be rotatably stacked relative to one another and positioned with the upper and lower positioning portions combined.

Abstract: A clamshell case includes a case bottom, at least one modular intermediate layer, and a lid. The intermediate layer has a coupling slot in an upper back thereof and a pivot block at a lower back thereof. The pivot block is held in a pivot slot of the case bottom, and the intermediate layer is pivotally fitted over the case bottom through at least one pivot or a pivot portion. The lid has a pivot block held in the coupling slot of the intermediate layer and is pivotally fitted over the intermediate layer through at least one pivot or a pivot portion. The costs to manufacture the clamshell case, which is assembled with a specific number of modular intermediate layers stacked on one another as required, can be reduced, because pivot blocks in all modular intermediate layers are of equal height and identical axial position.