Abstract: A system and method for removably joining two surfaces together with a connector using protrusions and slots. A protrusion rising from the surface is slid into a slot in a parallel direction to the surface so it is secured against being removed in a perpendicular direction to the surface. Various shapes of protrusions and slots are possible, including trapezoid profiles.

Abstract: A system and method for removably joining two surfaces together with a connector using protrusions and slots. A protrusion rising from the surface is slid into a slot in a parallel direction to the surface so it is secured against being removed in a perpendicular direction to the surface. Various shapes of protrusions and slots are possible, including trapezoid profiles.

Abstract: A holder for removable cups provides critical advantages for safe evacuation and efficient transport of removable cups. The holder securely carries a single removable cup by providing an interference fit that increases with the weight of the contents carried. The holder allows for safe evacuation of the contents of a single cup through provision of an integral handle extending down from the ring holder. When the invention is loaded with a removable cup, multiples of this Invention can be stacked in an offset fashion by inserting the handle of one unit into the vertical hollow in the handle of the next unit. The security of the cluster increases with the weight of the contents yet jamming is avoided through the provision of flat features in the handle. The offset pattern of stacking is also determined by the provision of flats in the vertical hollow in the handle. The Invention, when empty, can be nested stacked.