the double opening can lid 14 creation of the shelf 26 by the folding process described also may create a rear edge 43 that is generally straight as opposed to curved as in some conventional tabs the shelf may also include the notch 36 which is a small cut away portion in the center of the shelf 26 the notch 36 generally follows the rounded shape of the head 30 of the secondary tab 24 the notch 36 functions to allow the primary tab 22 to better separate from the secondary tab 24 when lifted past a certain release angle u03b8 as shown in fig4 a 4b including the notch 36 reduces the angle at which the secondary tab 24 separates from the primary tab 22 approximately 8 u00b0 even though it serves to reduce the release angle the notch 36 continues to allow the shelf 26 to depress the head 30 of the secondary tab 24 downward to create the vent opening it should be noted that the surface of the shelf 26 shown in fig3 b which is a bottom view is a top surface of the sheet of material 31 out of which the tab 12 is fabricated thus the surface of the shelf 26 shown in fig3 a which is a top view of the tab 12 is a bottom surface of the sheet of material 31 out of which the tab 12 is fabricated this process may provide advantages over an alternate process of coining and thinning a portion.