FIGS. 11I and 11J depict mirror images of yet another exemplary sleeve 1128 that may be used in accordance with the invention. (Mirror images are shown to illustrate all four sides of the sleeve 1128.) As shown in FIGS. 11I and 11J, microwave energy interactive elements 1124 a and 1124 b overlie and face outwardly from opposed side panels 1120 a and 1120 b, except along a peripheral margin or area