I guess I dunno which models have that annoying plastic lip on the top lid...you know..the one that prevents you from using the absolute minimum sized bag, because it sticks out a half inch beyond the general plane of the lid? Catches on the food and won't let the lid close? Use a sharp pointed knife...BACKWARDS. Yes, just scrape the point of a knife right along the lip/lid joint, peeling little shavings of plastic out. After 15 or so passes, it will pull right off. If yer interested, I'll draw diagrams, but it's straight forward and it WORKS!