includes a first projecting contoured portion 502 and a second projecting contoured portion 504 although fig1 is nominally considered to be a front view and fig1 a rear view these designations may be reversed as desired depending upon the aesthetic and structural requirements of any particular package configuration in an alternative preferred embodiment of the invention shown in fig1 u2013 18 is an alternative blister construction having enhanced stacking and nesting characteristics in some prior art plastic clamshell packaging schemes the plastic blisters are placed in an open topped displayable tray with a slotted insert configured to receive the side edges of the flanges of the blister to keep the blisters in an upright orientation for maximum exposure and easy access for the consumer first projecting contoured portion 502 includes a further outwardly projecting stabilizing u201c foot u201d 506 which may be of any desired shape except that foot 506 should not extend the entire width of contoured portion 502 second projecting contoured portion 504 includes an inwardly extending concavity 508 which has a configuration that is complementary to the shape of foot 506 again concavity 508 should not extend across the entire width of contoured portion 504 as can be seen foot 506 causes blister 500 to have a greater length of material that is in contact with the supporting surface underneath and thus has enhanced.