The present invention provides multilayer films and packages formed from such films. In one aspect, a multilayer film comprises an outer layer, the outer layer comprising a polyethylene having a density of 0.930 g/cm3 or greater and 0.01 to 1 weight percent of an additive, based on the total weight of the polyethylene composition, the additive comprising either a sorbitol acetal derivative or a bisamide as specified, wherein the outer layer has a 50% seal strength temperature at least 10° C. greater than an outer layer in a comparative film that differs only in the absence of the additive in the outer layer, when sealed to itself at a pressure of 5 bar with a dwell time of 0.5 seconds.